[DreamFlasher]

The first issue is solved by Quest 3: 1) calibration is a matter of seconds, 2) it remembers all previously calibrated spots, so I basically never need to calibrate.

Yes, you need about 2m² space if you want to move/do fitness, but that's something no VR can solve.

[seanmcdirmid]

If your fitness experience doesn’t involve actual movement from one spot (like BeatSaber, fitXR, supernatural, on shape, etc…) you only need about 1m^2, probably a bit less (basically wherever your hands can extend to needs to be unobstructed).

[int_19h]

Beat saber does require movement to dodge blocks, though. And while 1m of sideways movement might technically be enough to dodge anything in the game (not sure tho...), in practice it can be hard to not move more than that once you start. I certainly wouldn't want to do that risking crashing into the surrounding furniture by moving further than necessary.