Your assessment is similar to mine, set aside any cool features of the language, maintaining an Elixir app is the problem. The constant API shift with each LiveView release, not enough people maintaining hex packages, not a large amount of hex packages available forcing some things to be built, etc. Adoption in our organization was halted because of the messiness of upgrade path in Elixir as a whole. Projects that were built on earlier versions suffer the most pain where developers will spend like a week sorting through code changes needed to update. There are some neat aspects of Elixir but the maintenance trade-offs aren't worth it in management's eyes.