A team like OKC who drafted smartly, made the right trades to win a title with a young core can’t be long term because of the second apron. Now a bad org who do none of those things can offer a lot of money to break that group up.
I have always had that issue with the NFL cap as well.
If you draft well, you should not be penalized. If you make smart moves like Boston, you shouldn't be penalized that harshly.
You should be penalized for building your team thru free agency and signing stars from elsewhere.