Equipment, internet, devices and everything else evolves. Earlier, general internet speed (downloading\watching big files) was a problem for many (remember the dark ages of landlines with modem? Or having 100 mb \ month on mobile :O) and the forum's server space was restricted etc, this not being the case anymore, image \ attachment max size upped to 4 MB, which is more than enough for excellent image definition viewed on any dislay, small or large.
As always, use of external image hosting is a big and absolute no, for reasons well explained in posts here in the support board. Anyone needing to upload some very large file, send a pm and I'll arrange for storage on the server + link. For videos, still use Youtube and post links.