What specific version/feature fragmentation and clients are you referring to? As is common now, newer Synapse drops support for older Postgres (for example). Voice and video calls is the only feature that I can think of that is half-assed in Element/ElementX or not implemented in some clients.
Otherwise, Element, Element X, FluffyChat, Fractal, freaking Cinny on Ubuntu Touch (!), and terminal-based gomuks all support basic functionality, DMs, rooms, encryption, and attachments.
That is also the premise of one of the stories in Asimov’s I, Robot. Human operator did not say the command with enough emphasis, so the robot went did something incredibly stupid.
Those stories did not age well… Or now I guess they did?