Yes, I said "never", ..dont be a dick. Leaves don't block light, they use it. Don't try and change what the meaning was, of that I said.
Block means it make the movement or flow in (a passage, pipe, road, etc.) difficult or impossible.
Secondly, leaves work as a collective,and all connected through sieve tubes. If you had two train engines (connected) on one track, pulling the same load, neither one is blocking the other. They're doing the same function. Again my words taken out of context, so,... "No" that is not my logic, as my point was only referring to the capacity in which I just mentioned. Again...don't be a dick. This is exactly how it all started with needynate.
I could give two shits as for if you do, but test it you're self, Take two mature plant in equal amounts of DWC. Now strip the leaves off one. See for yourself which one uptakes more.+90% of all transpiration is done through the leaves. ....negligible my ass.