Why is Eclipse for RCP so pit ~?

I met a lot of obstacles on my way to learning Carrot2, and none of this made me mad, that is, Eclipse does not automatically add the required Plug-ins to the build environment (I don't know if it's reasonable to say that.) ）

Event Cause: Running Eclipse application encounters application error plus a series of bugs that don't know what the hell

FIX: Run-->run configurations-->plus-in (This is a tab)-->add required Plug-ins-->apply-->run

OK, just so easy, it took me an afternoon time.

Why is Eclipse for RCP so pit ~?