Yeah I'd agree its probably over assumed here more than other places, but it's definitely not uncommon in other online spaces... I find it hard to believe it's something you've never seen before unless the only other space you've been is Instagram or tumblr and only following food posts or similar...

FTFY:

The assumption of tech savvy around here is wild! Never been in another online space where [all the] people [there] assume everyone is at a reasonable tech level.