May be wrong, but they seem to be very focused on interesting stacks like Elixir and RoR while building on Go/Rust. The corollary being neglect of the bread/butter stacks with high market share, like Python and Java/JavaScript. Don't think I've seen a blog post discussing those three beyond a passing mention?

Not the end of the world, but mildly disappointing. At least they are all in with Postgres and Linux, a great foundation.