While PDX-published games may suffer from the decouplement of features between DLCs, at the very least PDS-developed games have a built-up expertise when it comes to managing this.
As for MMO model, it’s a hard sell because purchased things get made “free” for new comers. It’s one of the crux that EU4 faced when they rolled many DLC features into the base game.
My company pays it for me. My use cases are split between new development, refactoring and debugging.
For new code, given that our code base is proprietary but very extensive, it provides nice code snippets that would be a pain to write by hand (it’s mostly C code) such as test code
I can focus on the concepts and have the autocomplete do the rest for me. I swap keypresses for reviewing code, which is not bad.
For refactoring, I seldom use it because I haven’t found an use case for it. Most of the changes involve moving code around, adding glue or deleting dead code.
For debugging, I sometimes use the chat to get documentation on public APIs from Microsoft or other places. I use this documentation to check for invariants and to reduce the scope of what I’m trying to find out.