These days just about any surface mount part should be assumed to have been attached by a machine, and for very good reason.

I am capable of assembly with 402 and 603, but I can't even begin to imagine that going well on an assembly line.

(805 is somewhere around the size of small rice, 402 is half that size)

Yeah, I don't mind doing QFP and SMD resistors (actually QFP is pretty quick when you get used to it), but individual resistors take forever.

Also, I forgot to mention most processors are BGA packages AFAIK, so impossible to actually solder manually.