picking leaves does not make the plant focus on budsites.. this is 100% false bro-science nonsense.
You might delay flower in some cases, which may or may not be a benefit. the plant will focus on regrowing enough leaves to properly power itself, unless it's too deep into flower then it'll just be underpowered for no reason other than OCD and some bad suggestions.
leaves power growth. Removing them means less energy for cellular reproduction. Less tranpiration, which means less CO2, your limiting factor most of the time unless supplementing it. all the building blocks stored in the leaves? gone. just threw out large portions of your fertilizer you bought and fed.