I am going to miss being able to host TypeScript in a web view however.

Meh. Flaming about this is so exhausting given that the war was already fought and we know who the winner is.

First, that's the typescript compiler, not typescript apps. And it was a ground-up rewrite effort (a very large one) with a specific eye toward improving the performance of the original, which was widely held to be sub-optimal for reasons entirely unrelated to implementation language. Suffice it to say that, hell no, you can't just transpile your code to Go and expect it to run faster. We all know it doesn't work like that.

But more broadly, landing with "Please don't use Electron" in the context of a comment about a MS product seems weird given the implementation framework of Microsoft's single most impactful new UI project of the last decade...

Just stop, basically. You lost. Use Electron. It works great and everyone else already does and proved you wrong.