Steam Controller got plenty of support, and new features added. the software support, which includes an extreme amount of customization options, was extended to the Xbox, PS, and Switch Pro controllers, making it so you can play games with no controller support with any of those controllers. and now that software will be used in this device, along with trackpads, haptics, and other things that Valve first used in the Steam Controller
Steam Link moved away from dedicated hardware to a software solution. now you can just download it for your phone or TV. and I'm sure this device will support it, so you could use the Deck to stream from your (more powerful) desktop
Steam Machines didn't really take off, but they were just small form factor PC's (not made by Valve) running Steam OS. most of their partners just repurposed machines they already made. but Valve put in a lot of work on their OS, improving Linux support for games, and leading to Proton. now the Steam Deck runs Steam OS, and benefits from all the work they put into it
none of this shyt was "abandoned". it evolved into the Steam Deck
the HTC Vive was one of the first commercial VR headsets. it was an important part of people figuring out what a VR game could be, and how it could work. now the Index is probably the best VR Headset out, and HL: Alex is the best VR game
