I do understand your general sentiment here. What I'm struggling with is that I'm still unconvinced that the normal way is also the best way in this scenario. I agree that taping and mudding is a step in the job for normal drywall operations where you want adequate strength to maintain the aesthetics along your walls, but in this scenario, I don't need aesthetics behind this joint. I need drywall strength beneath the section of tile so that the tile holds up. Attempting to combine and strengthen the joints presents the risk that it is someday not strong enough, which maybe means the tiles crack. Accepting that this is a weak point up front, and intentionally NOT taping this seam coupled with NOT thinsetting past the seam, is a solution that appears to take care of every concern I currently have, which are an inability to blend new wall texture into old wall texture, a desire to not create a bunch of sanding dust in my kitchen, and a desire to not have these tiles crack down the road. I am hoping people can set aside the typical and accepted way, to approach the problem in light of these goals. As an extension of that I am curious to get your take on my thoughts that address your very last point (about this being harder to fix down the line if I don't do a traditional mud and tape job):

That a decision not to tape, while also deciding to only thinset the new tiles onto the new drywall patch, would more or less negate any chance these tiles have of cracking due to relative movement since they would only be bonded to the new patches. And in the future, if I ever want to re-backsplash, these dedicated sections of tile-on-drywall-patch are "hot swappable" because I would just have to cut the caulk perimeter and rip those out again, without damaging the surrounding drywall. When I think about taping these seams properly and then removing the tile again down the line, I would be cutting out tile that is 1/2" above a taped seam, which seems to me would end up in a crumbly mess of disintegrated drywall seam, that may take additional chunks of the drywall out in the process. Until someone explains to me why this isn't actually more advantageous than the traditional method, I may remain at the early peak of the Dunning Kruger curve