How have you found it unreliable? What system are you on? I have had no issues on both Linux and Windows, but I'd be happy to figure out why you're having issues!
i am on linux ubuntu 22.04 . i try to control the pc using my phone screen as trackpad and its on display keyboard but can' achieve that. i also have this gsconnect gnome extension and both my devices are yet to be paired. ngl i am also using this obscure chinese brand called infinix for a phone, so its not necessarily a samsung or a pixel. apparently mouse and keyboard extensions aren't supported on kdeconnect for this device but idk
i remember looking it up on flat, or less likely on snap-store (i rarely open it..so probbaly flathub yea), and it doesn't to be maintained really i agree