Mini Format Pack is an add-on after all. While it’s quite common for Anki users to install add-ons, I believe the majority will still benefit from this new implementation - even if there is no feature parity to Mini Format Pack yet.
The recent changes to the editor aren’t trivial and it’s a step-by-step process. I for one would not want that process to be slowed down because it doesn’t fit well with an add-on.
You could ask the add-on author to implement a hiding mechanism for the vanilla buttons.That wouldn’t be difficult. Just did that for you:
Perhaps hiding individual buttons will even be natively integrated: