What I see is that if a front end wants to be "a Reddit" on a blockchain it can.

Steemit.com has proven this.

What I also see is that once SMTs are released, which is next on the "To Do" list, that there is no limit to what all can be done + be powered by Steem.
No limits as outlined by you "They can do that! It’s their website".

So there really is no need for Steemit Inc. to "hack" their own UI, in fact it would probably be counter productive (as outlined by @sorin.critescu ).

Love it, see some awesome potential out there for Steem.