I've seen some use it fine, but just because someone says they are using a product doesn't necessarily mean they are. I'm not trying to create a conspiracy theory, but it happens with strains, too. Someone can be motivated to lie about a strain just to get into a contest. Those same type of people would happily lie for sponsors.
More often, i would wager it's either someone that's learned to use it (different from instructions) or doesn't depend 100% on those products or a combination of both. E.G. with FF trio you see mostly burnt up plants and claims of 'i followed the direction,' but then you find a rare diary where they use it and maybe 1 or 2 other supplements and it is a good looking plant deep into flower. They usually use a lot less than directed in this case.
So, a combination of things likely add up to what we see. user-error and a poorly balanced feed as instructed. Esoteric recipes that ignore existing knowledge because they think marijuana is special and different because they like getting high (well, more likely because of plain ignornace, lol). These esoteric formulas may work with some marijuana plants but not a wide variety.
i've never been sure if biobizz is a soilless or soil? if the nutes are 100% plant ready/avaialbe, can use an app like hydrobuddy to find the dosing necessary to reach various target PPMs for each nutrient molecule. It may need more than 1 product to get there, obviously.. can't turn a 5-12-26 to 6-7-12 without mixing in other stuff.
research for soilless/hydro context fertilizers (100% plant ready components when dissolved)
1-1-2 (npk) and 4-2-1 (K-Ca-Mg) is what the research says, but with this particular plant it does need more magnesium, and these numbers are heavily rounded. They aren't meant to be taken too literally. they work well on a wide variety of similar species of plants, too. I believe it's similar to the more 'fertile' farm lands of the world. It wasn't pulled out of a hat. It involved a hell of a lot more data points than some mope making a marijuana fertilizer company in their garage.
I don't use hydrobuddy but i use a spreadsheet that crunches the numbers for me based on dosage of products used. I am familiar with ppms more so that weighted averages of percent labels, but it doesn't matter which you get familiar with as they both scale with each other proportionally.
My current weighted average of these things are 7.2% / 7.9% / 12.6% / 6.4% / 4.5% (npkCaMg)... You can see i'm closer to .75-.75-2 and 4-2-1.5 ? Over time these are the adjustments i've slowly made from Jacks 3-2-1 instructions. They aren't much different... These ratios at 1.3-1.5EC (or even higher) workout to ratios of nutes around the roots that facilitate easy uptake without impeding each other.
These ratios were not mined by jr peters. They use the same knowledge base several other fertilizer brands use to formulate a similar but different "hydro" fertilizer setup. Each has a basae that varies slightly in NPK but similar... plus calcium nitrate and epsom, if needed. Southern Ag has one.. think athena or floraflex used to, but now they've broken it into 4-5 products thet still add up the same way, lol, that way you but 4-5 overpriced products instead of 1 + 2 generics (cal nitrate and mag suflate are cheap commodities)
It's not the brand name... it's the ingredients and resulting ratios of nutrients that matter. If i can get to these targets i'm confident i can use any fertilizer with gauranteed analysis labels with similar results. This stuff is all made with the same pool of ingredients - relative to soil vs soilless/hydro fertilizer with some overlap, of course. It's no accident the 'better' soilless/hydro products have a very similar ratio of ammonium based nitrogen to nitrate base N (i may be getting the vocabulary wrong, but the 2 primary sources of N, ammonium nitrate is usually a 1/20th or whatever smaller proportion of the two). One tends to be faster acting (nitrate) but there are synergistic benefits to having both even so. I may have mispoke about this but it's something that you should be able to corroborate with a cursory google search even if my numbers or exact vocab are a bit off ( the nitrogen thing but also the ratios i mentioned above too).
another tidbit - that's a soiless/hydro ratio because the form of N requiring mcirobes to break it down needs to be different to effectively supply the same amount of available N to the roots over time. This, along with other molecules needing that same intermediary step is a big reason why soil EC is likely higher than you expect for soilless/hydro. You have EC contributed by the 'inventory' waiting to be broken down as well as the finished product(s) that can actually go into the roots. think the N that requires microbes needs to be 150% greater? meh, i'm not a soil grower.
But, learning weighted ratios or PPMs of your fertilizer when it works awesome and for nearly all plants is translateable... you can expect similar results with any products... (of the same category, i.e. soilles/hydro vs soil nutes in a loose way that doesn't cover all the bases, but good enough for this answer. readily available vs not readily available)
are there some substitute ingredients that might cause some slight variations? sure, but that all gets fixed in our 'fine-tuning' over time. read plant, adjust formula until only a rare plant isn't supremely healthy.