We've recently added back Xbox support. The extent we can support it depends largely on console makers. IIRC the original Xbox support was deprecated because Microsoft dropped support for it. Support is essential to ensure things keep working - keeping using unsupported software means risking waking up one day and suddenly it's all permanently broken and Microsoft won't provide any support and everyone's projects and game launches are ruined. (The same rationale is behind the Addon SDK v2 - addons using unsupported features risk the same thing in Construct itself; experienced developers know not to go anywhere near anything that risks that level of disaster, and that's the same thinking behind not trying to use unsupported Xbox technologies, no matter how important it might be for the product.) In my view it's better for us to say we don't support it either than try to keep using it with that risk hanging over us. IIRC it also used the legacy Internet Explorer browser engine, which we dropped support for years ago, so we wouldn't have been able to keep supporting it until now anyway.
The new Xbox support is based on WebView2 which is based on the Chromium browser engine. From my tests the technology works great. The main issue is it only works in UWP and Microsoft have restrictions on how you can publish UWP games. I don't know why they have those restrictions and I don't know if they plan to change it. It would be best for anyone interested in Xbox publishing to contact Microsoft about that directly as it's entirely out of our control.
Supporting other consoles has been extensively discussed in the past, but in summary, if console makers provide something like WebView2, it is fairly easy for us to support; if they don't, it is extremely difficult to support and so far I don't think it is feasible for us to do it. Xbox has WebView2 but only for UWP, and as far as I'm aware (NDAs make it harder to tell), PlayStation and Switch do not have anything equivalent. The status quo is using third-party porting companies converting Construct games to console, which is probably the best we can do for the time being without support for web technologies on consoles.