I’m using Jerboa on Android and I can click a comment to hide all children under it. On lemmy.ml on the website I can also hide children by clicking the little minus next to the username.
I signed up as a lemmy.ml user before they started getting hammered and ended up making a new account at a smaller server. I think a lot of the lag yesterday was a result of droves of redditors heading over to the bigger lemmy servers.
Good mobile apps are key, I agree. My main use of reddit was on mobile. Currently using Jerboa, which seems okay except it keeps logging me out for some reason.