>>271258578
Rift S does not have fullbody tracking built in to it, no. It is possible to use fullbody tracking with it (I think?) at least based on the assumption that it works in the same way the original Rift did where someone made an application that could allow for the Vive trackers to be coordinated with the Rift trackers playspace in order to emulate full body. This works (at least for the original Rift, not sure about Rift S) but is still nowhere near as good as the Vive, which the trackers were actually made for. There's a lot of desync issues and having to calibrate a lot and overall it's just a mess that isn't worth it.

In terms of finger tracking, the Rift/Rift S *sort of* has finger tracking in terms of it can detect when your finger is hovering or touching a button or a trigger or a grip, but in comparison to the Valve Index's finger tracking which actually tracks each individual finger, no it doesn't. Honestly though, finger tracking is kind of a meme that very little games support and even the games that do support it feel gimmicky.

If you're set on having full body for VRChat but don't want to spend the $1,000 for an Index (+ $300 more or so for trackers), get a used Vive, and used trackers off eBay. Vive is outdated, but not "bad" by any means.