I gave a presentation in the office about Solid a while ago and one of the guys said: "So this looks like React, it's easier to understand, it's faster, smaller, with more build in stuff... why are we not using it?"
Ryan, the creator of Solid, mentioned in one of his interviews that the fact Solid is gaining traction slowly is actually a sign that the web has matured. People are no longer as quick to jump to the next flashy thing - and I agree.
It was a sad day for me when it got bought and integrated into Dreamweaver.
Recently discovered something similar: Flexoki - https://stephango.com/flexoki
In my currently opened project I have: vtsls (for typescript), biome, emmet, and the snippets LSP running on the same file.
You can configure which LSPs you can run on a language basis. Globally and per project. You can also configure the format on save actions the same way. Globally and per project.
I have astro project that on save runs biome for the front-matter part followed by prettier for the rest.
I would say that's pretty flexible.