I have a rift S so unless there is a way to port it via app to steamVR i'll not get to play it as while exclusives are okay when they are permanent it's super annoying and when your headset is via the same company, is why i'll never buy a meta headset again as no doubt by the time they make anything newer these current quest headsets will be locked out of things as well. I do not like a standalone headset when underpowered over time and with a cable connected to my PC that gets updated dwarfs these quest headsets just a waste of money to lock into that eco system.
My real hope is a SteamLinkVR at a lower price than index and i'd instantly switch.