I moved this site to Biome for the obvious reason: one fast tool for linting and formatting instead of two slow ones. Its built-in formatter handles Tailwind class sorting and import organizing, which covered my two Prettier plugins on paper.
It didn't stick. The formatter is still in beta and behaves weirdly in some cases — classes it shouldn't touch, output I couldn't predict. Formatting is the one tool output I read all day, so "usually right" isn't good enough. I moved back to ESLint and Prettier with the official Tailwind plugin, which sorts classes the same way every time.
The open question is splitting the job: Biome for linting, where its speed matters most, with Prettier and the official prettier-plugin-tailwindcss for formatting, where correctness matters most. I haven't tried that combo yet. Biome's speed is real and I'd like to keep it — I just don't trust its formatter with my classes yet.