I've been in and out of vim, but never reached the 'extension' point. Probably due to lack of necessity, and Java work has pushed me further away :/ But mind

I've been in and out of vim, but never reached the 'extension' point. Probably due to lack of necessity, and Java work has pushed me further away :/ But mind if I ask why you select instead of e.g. "5yy"? Used to thinking visually, or does it do something different with buffers, or...?