Thanks for tagging both accounts :)
I like the ideas here! One of the things that I tried to do when I did the sidebars on !newtolemmy@lemmy.ca, was to keep it as short and simple as possible. I was hoping to increase the chance that someone reads enough of it to be encouraged to subscribe and post. Looking at that one again now, there are some things that I would change to make it even shorter and cleaner.
Long term, it would be nice to have a general help community for people to post questions in. That way, if someone is very lost, they can just post there and get some answers.
The part I'm not sure about is if we should close the other platform specific communities. A generic community is good for those who don't know where they should post, but it might discourage other people who want to stay subscribed to it. New people might get confused by posts that discuss features that don't apply to the platform they are using, and experienced users might not like seeing a bunch of posts about a platform they don't have experience with. PieFed's feeds might help in the later case, where experienced people can create or subscribe to a feed of a bunch of help communities. That way it's still easy to answer questions, regardless of where new users decide to post them.
It allows the same type of posts, but no harm if we want to build a few communities for people to use :)