End of Flower, Yellow and crusty leaves ok ?

it's something you want to avoid as best you can. Sometimes senescence is impossible to avoid, but this looks more like a progression of nute-related damage. It's not a big deal, don't think it "ruined" anything or at any scale near that. It's just something you "can" improve on. Less photosynthesis = less growth or at least slow growth. So, damaging the canopy does reduce photosynthesis. the plant will survive but there's no sugar-coating it as anything but a negative impact. good news is it looks like it started back around week 10? So it is a slow progression that will only take a small adjustment to frtilizer formula, or if soil and a heavy feeder, a little extra runoff and a partial reset half way through flower, along with a slight adjustment. Did this start at the bottom initially? i can't see in your diary. If so it's probably N-deficiency, but if it started at the top it's likely something else (mobile vs immobile nute, if it starts at the top it;s more likely immobile) If that is the case, too much P or K can cause chlorosis in newer growth. you may have more than 1 nute-related issue. Those plants i back-right corner of video seem to be extra crunchy uptop.. i'd lean twoard too much p or k on thos, but the others in the front looke to have some yellow up and down the plant.. that lokos more like N-def. Diagnosis from leaf symptoms amounts to a guess with limited information to help. you can download any leaf symptom chart and compare for yourself, too.

Nah, looking good, so nothing to change. You could take them off (necrotic tissue heats up plant), but they fall off anyway. Happy growing 😄

It's OK, the buds looking fine! 👍😎. As the nutrient .conc drops the plant draws mobile nutrients from the leaves. Keep up the good work! :)