I've always wondered this and never asked. Sh...

If you're nailing the nutrition, don't do a pre-harvest flush, and the genetics don't support it, then there's a good chance you won't see senescence and there's nothing wrong with that. As long as you're happy with the trichomes on your grow, then no one can you tell it's the wrong time to harvest. There's a lot of debate about "flushing" and what it can or can't do for your plant (including a lot of recent research on this). Many top professional farms don't flush at all and as a result they see little to no senescence in their crop. That said, I always flush - probably due to habit and/or bro-science - and I do always see a "fade" as a result. I've no way or telling you if this actually improved the smoke or quality though. Latest research suggests that it doesn't really help, but that probably won't stop me doing it every harvest! 😂