I feel the same way. I don’t event use the classic editor, though I have it installed. I have it hidden on all sites I build and use only ACF WYSIWYG fields.
I can’t really answer all of your questions. You should contact the developer.
Guberbug includes a classic block, this classic block uses tinyMCE.
As long as this block exists then tnyMCE will always be included in WP.
Even if this goes away I am confident that Elliot will find a way to keep the WYSIWYG field working.
But like I said, for a definitive answer you’d need to ask the developer.
