I really like gleam, the vibes are 'right' for me in that its got a strong type system and a functional style. Coming from scala land, that feels natural.
I think the author hit on a core challenge gleam will have to face, outside of dx. its main niche would be highly scalable type safe server apps, pretty similar to what scala is/was originally imagined as.
Its very hard to occupy that niche when by definition the projects you look to take on are large enough for languages to be heavily scrutinized. Your CTO wont really care if you choose rust, node, or go for some internal tooling. They will absolutely care about what is being used for core distributed services, and that just makes adoption hard.