[urschrei]

I'm not a regular Zed user, but this isn't true: I simultaneously ran the Ruff and Pyright LSPs when I used it last week.

[rootnod3]

In the same file?

[tuzemec]

You can run multiple LSPs on the same file.

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.