The three-year gap in processor updates you're complaining about disappears when you recognize the 12" MacBook as an attempt to move the product line in a different direction, which Apple partially backtracked on after a few years. That course correction was quite a bit quicker than for the Touch Bar MBPs and the trash can Mac Pro.
and if my grandma had wheels she'd be a bicycle. As far as I can glean this was never something that they intended to do.