Is there a solid explanation why most prefer to pi...

I pinch my Plants because of having my " tools" with me.....and sometimes i take asmall scissor . but only if i cant reach in the place with my fingernails. So i do it because of having my tools always on my fingers and dont have to search it.

Sure, most people do not have a fiskars on hand or one at all. I'm sure some people could argue that unless you regularly clean your tools, you could infect your plant.

make less mistakes using finger nails deep in the canopy going by feel is better than trying to peer through and snip

lol I love DoctorPhilgood's comment... Here's where some old school grower usually chimes in and "Iv'e grown hundreds of plant and always clip with my finger nails and never had a problem".

Laziness. Haha. Well, "convenienc"e is probably how most would like to put it.

umm no.. I don't like to use my hands cause I feel like that's just extra chance of contamination/bacteria. If you wanna use your hands that's your choice. Generally I like to use the same pair of Fiskars and I will clean them with isopropyl in between uses.. I hope this helps and happy growing.