I don’t get your point. How would SMTs bring functionalities that are not already in STEEM? They are just copycats, they can’t have different reward mecanisms.

They might have different inflation, supply, etc but rewards will be payed out every 7 days.

Even if you can change the amount of days, you still can’t have an infinite amount otherwise the author never gets payed. So you need a finite amount of days but different posts behind a single one anyway.