The integration is still there and it is mentioned in our assets guide: https://hexdocs.pm/phoenix/asset_management.html#third-party...

Regarding import maps, I am still slightly skeptical. First they don’t solve all needs of npm (for example, what if you need to precompile your FE code?). Second, I have feeling that every import map management tool will eventually become a package manager through slowly creep in of requirements. At the same time, there is nothing stopping anyone using it on their Phoenix apps if they so desire.