is that so different to most other platforms?
Only FB and Insta (now owned by FB) really allow videos to be uploaded to their own platforms because they're so massive and have put a LOT of work into it. Early on you couldn't post videos to Insta at all, then when they introduced it, initially it was only 15sec.

Steem is still in its very very early days not to mention it IS still in beta - I wouldn't worry too much about whether or not you have to post videos to Youtube and have it embedded here.