I don't think CockroachDB supports anything other then serializable isolation level, so of course they are going to be pushing this type of argument. Its an interesting philosophy really. It would be one thing if the performance penalty of running all transactions at serializable isolation level vs weaker isolation levels was reasonably low, but its not (see [1] - yes I know the entire difference in performance here is not due to CDB using serializable transactions for everything, but I'm guessing a very large part of it is). Its kind of like saying the only cars in the world should be ford pintos because we don't trust folks to safely drive faster cars.

[1] https://www.scylladb.com/2021/01/21/cockroachdb-vs-scylla-be...