Dino and Gajim both crash frequently on Wayland (Sway in particular) due to GTK issues that I'm not expecting to be fixed any time soon. Gajim also gets very slow the longer it's open, can't recall if Dino was the same. Dino also has the usual GNOME-y issues of being over-simplified and lacking in customization and features. When I changed from Dino to Gajim I was shocked at all the stuff I could suddenly do, was weird to think both were XMPP clients.

Something with Gajim's features but using Qt would be pretty great potentially. GTK stuff also often has this horrible thing where it fades the window when unfocused, which gets really awful and unresponsive when things get laggy, also ruins screenshots. Never figured out how to turn it off. Part of the theme apparently, but GNOME also doesn't want you customizing/changing your theme. I'm just using Adwaita-dark usually.

Matrix clients aren't great either, but overall Nheko gives me less trouble and pain than Gajim, using both daily. irssi (IRC client) is kind of my gold standard for stability/performance/features with weechat being mostly okay too.