> The only possible flaw I can see is that the strap it ships with doesn't go over the top of your head. If this ends up being an issue in practice, somebody is going to make a third party strap that just fixes this problem

Not even a third party: https://youtu.be/b7q2CS8HDHU?t=380

> the option of an ergonomic strap that you can hook onto the top, hook onto the back, to take more weight off the front of your head.

https://www.pcgamer.com/hardware/vr-hardware/steam-frame-spe...

> There's an optional ergonomic accessories kit for the Steam Frame that adds an extra strap for your head and a pair of straps, one for each controller. These added controller straps are reminiscent of those found on the Index and seem like a reasonable investment, if the price is right.