Basically the company has trapped themselves creatively due to strictly business decisions. Mainly their high profit margins. If you ever studied economics or invested, you know what it means. In simple terms, they've promised their shareholders big profits and they can't simply not deliver it, they singned up for this business model long before their current groups debuted, it is nothing personal.
And their strategy worked well, until Hybe was born. Hybe (and YG to lesser degree) treats its groups as a vanity project. They are allowed to burn cash and operate at break even point or even go to minus if that helps their project. Things like spending money on playlisting is not a justified spending for example as it is just an exposure, it is not a profitable thing to do. Overspending on MVs is not a profitable thing to do either, it is a nice thing to have, but it is not a necessity. JYP groups can only do promotions that have financial justification.
So basically what I am trying to say with all this is, in order for things to change for Twice, Itzy, Nmixx, SK and etc. an structural change needs to first happen at JYP on corporate level. Which is currently impossible because profits are good.