Regarding platforms that I use outside of Steam, GOG and Epic’s client comes to mind.
That, and the Xbox client on Windows 10.
For me, I would like to see a mixed focus on Galaxy and UWP. While the other 4 platforms are nice to haves as they extend the utility of SpecialK, I have personal resentments of the companies in charge of them. EA and Ubisoft could never get into stable grounds in their corporate PRs, Bethesda is its own mess of a problem, and honestly Epic can go take a hike with all of the gaslighting it has pulled on both PC and mobile gamers.