Why don’t more libraries support schematics?

Ng add angular material gives you the library installed and configured. PrimeNg and Spartan does not do this. Instead you have to either config manually or run a :init schematic manually. Same for updates with breaking changes in PrimeNg.

Also why wouldn’t tailwindcss support a simple ng add tailwindcss schematic? I can understand if the library is not angular specific, but what f.ex. about PrimeNg?

Is it very complicated to support, are the developers «lazy» or are there better reasons?

Thanks for your insights.