DWC water change or NOT?

If all is well in my water and I’m switching to flowering that week I usually like to just add like a half dose of flowering nutrients to the existing water. This keeps the nitrogen going for the transition week. Then I change out the water to flowering the following week. Not sure if anyone else does it this way, just seems like the logical thing to do. I use a reservoir mostly though so I can go a bit longer with the same water. When I’m growing in just one or two bucket I tend to change the water since there is only a few gallons and add both veg and flower nutrients for the transition week then change it out the next week and only add flowering nutrients. Whatever is less work...lol but everyone will probably tell you to change it ritually every week. I don’t like wasting nutrients though and I use a lot of them, so I tend to let it ride longer then I should sometimes. Lol hope this helps! Cheers!💨