Author here. I agree there's been a resurgence lately. My working theory is that the performance of the underlying hardware has increased so much in the last decade that the simplicity of SQLite has become a more important tradeoff than the extra performance boost you may see with Postgres/MySQL. Also, network overhead tends to dominate small queries so SQLite can actually end up a lot faster since it's in-process.

I wrote up a longer version here: https://fly.io/blog/all-in-on-sqlite-litestream/