While in principle structural editing sounds like an incredible advance, there are 'good enough' advantages to plain-text tools that make it a much more practical solution. The other issue is of course integration with existing tooling, which you either skip entirely or compromise on the design.
What I feel is missing, between the description of "old, bad state of things" and "utopian vision" is a review of some of the projects that already tried to achieve this ideal state. It turns out there are a number of them, and most of them failed to achieve any traction or impact [0].
The rants are very long, so I skimmed quickly the one about git; I understand the complaints, although git is only bringing me joy and no pain --interactive rebase, absorb and a few aliases made it a breeze. But in a similar fashion there are projects trying to solve its fundamental issues, like pijul(.org); what are they missing?
[0] https://github.com/yairchu/awesome-structure-editors/blob/ma...