Hey again, Joel! I spoke with a product owner who used to be on our Automation Team, which we've sidelined for now as we focus on other projects. He reminded me that we do currently offer this functionality for field change triggers based on radio button and dropdown fields.
We want to offer it for text and numeric fields, too, yet we don't have a team pointed at Automation right now. I'm marking this as Not Planned, only because we don't have that work scoped out and, well, planned, but we're on the same page as you in wanting this functionality! I'll keep you posted with news as it comes.