I think it would be pretty cool to add a true any% category which is basically where you can do any, and I mean ANY, glitch, regardless of whether other platforms can perform it or not. For example, the piercing bug, walking and teleporting at the same time, invincibility glitch, no teleport delay glitch, etc. I get that these glitches are too powerful to be even allowed in the any% category which is why I suggest a separate category is created for them. An example of where this has been done is in Pokemon Red/Blue speedruns. There is a glitch that can literally skip the entire game so it has its own category where the world record is currently 1m 18s, yet the main any% category doesn't allow that glitch, and the world record is 1h 45m 05s.
Was it intended to be a thing when devs were making the game?
Yes: It's not a glitch No: It's a glitch
Even if it wasn't intended, there are some special cases where they allowed it such as double shooting, they know how to fix it but they left it in, meaning it can now be considered not a glitch. But the only way to fix glitch walking would be to not allow the head to move if the player isn't inputting a move button on the controller (such as a trigger or joystick). So technically yes, they could fix it, but not making the head stationary at all times would take the reality aspect out of VR so it's not worth it. It's not intended, and they can fix it but haven't because it would ruin the game more than the glitch, so I would consider it a glitch.