Eve runs great on the Steam Deck - you can run 3 clients outside Jita with audio off and low graphics which is pretty impressive. There are three main problems however, the less important being for multiboxing it’s slow to swap between clients which I don’t think CCP can do anything to fix (other than pester GabeN for a window switch bind). The main two of course are controlling the game without a keyboard and mouse being rough and the small screen size. The UI revamp can impact both of these areas substantially if factored into the design so I really hope FC can keep it in mind.
I’d suggest looking at Path of Exile 2 for its amazing dual interface design where kb+m has a distinct interface from the controller interface so both control methods get an optimized interface without negatively impacting the other (as was so often the case with “console ports” to PC" being terrible to control with kb+m. Going so far isn’t required, but some of the ideas from it could definitely be appropriated and activated only for use with a controller - an example being auto aim with an FPS being controller only to help keep up with kb+m players.
The existing radial menu helps a lot but a lot of things could be added to this and ideally it would be customized with both always showing and context relevant options, ie. it would be good to be able to orbit current target without needing to activate the radial menu on the target itself which is substantially slower with a touch pad on a small screen. Faster access to important and regularly used commands would help a lot, as would being able to access many of the keybind commands without having to manually setup layer upon layer of steam controller bindings.