I don't contest that you lose tracking behind your body with inside-out, but honestly, having used a Santa Cruz pretty much every day since November, it's such a non-issue that the average consumer won't notice. We've actually seen more problems with holding the controllers too close to your face than we have moving them from behind your back. Furthermore, given that Beat Saber is coming to Quest, that alone will attest to the whole "swinging a controller out from behind you" being OK with inside-out - because that movement had so many issues on Rift with just the front-facing cameras, and why lots of competitive Beat Saber players moved to 360 setups on Rift.
Inside-out is the future. Outside-in is a huge blocker to general adoption because your average-joe won't want to faff around setting up sensors.
How in the world did you get your hands on an oculus quest?