Jerboa and Connect do that with account switching too.
Lately I've been leaving different accounts in different apps to reduce confusion. Having the same user name on the different instances is a bit confusing with the account switcher.
Because sometimes I prefer to not have my feed full of LoTR memes, cats, boobs, no poop challenges etc. And some times I don't want the news breaking up my cats, boobs, no poop challenges etc. and I haven't found a better way to do that in Lemmy.
I miss multireddits, a workaround I found is to create accounts on different instances and subscribe to different communities with each account ie
News trabic@lemmy.world
Memes and other bullshit trabic@lemmy.one
"Math" trabic@lemmynsfw.com
Then just login to which ever one I'm looking to browse. I don't think this will screw with the fabric of the fediverse, is there any reason I shouldn't?