Personally Im very happy with the 5.0 software. The windows software has become way more snappy.
But if your not ready to take the step that’s absolutely OK. I’d give you the same advice as we give our sons or daughters: If you don’t want it just say no, just don’t do it. That’s totally fine.
When the update option pops up, choose ignore. The update won’t be offered again until the next update. You can still update later if you want. The same goes for the controllers.