You’re missing a huge point: there’s a ton of devs that went into react bootcamp or whatever. Building a 50 person team on a technology that isn’t widely used or heavily supported by Google/Adobe/Microsoft is a huge hurdle. Even Typescript isn’t really used correctly, people basically use ts-lint on a lot of projects I see. For large companies they will also turn projects into BAU (business as usual) where the pressure is to push down costs and move it overseas. Finding a large overseas team on htmx at React prices will be difficult.

Typescript is popular because people don’t use it a lot, and it doesn’t break things.

If you’re introducing something new the bar is incredibly high to be obvious as to why to switch.