Wow that sounds amazing, can't wait to try out Obi 7! Thanks for all your hard work and great support, you're a very inspiring developer 
One more thing I wanted to add to the HDRP discussion is that its not just about getting nicer materials and lighting. For me it's all about getting access to TAA which is absolutely crucial for visual quality in VR. The HDRP TAA is so good that it's actually comparable to 150-200% supersampling at close to no performance impact. There is some ghosting of course, but it is very tolerable compared to either a massive performance cost with supersampling or really nasty specular aliasing with mulitsampling and FXAA/SMAA.
Without HDRP support, to my knowledge there is simply no way to get TAA with Obi in VR.
The postprocessing package for the builtin RP does have stereoscopic TAA in theory, but it is completely broken in multi pass mode which is needed for Obi. It gives a taste of how great it could look on left eye, but the right eye is full of horrible artifacts and afterimages. This was reported almost a year ago and still hasn't been fixed, if it ever gets a fix it's probably not anytime soon.
The URP doesn't have any official TAA, there is only a paid third party TAA asset. It actually looks pretty good and is more customizable than the builtin RP or HDRP TAA, but unfortunately has no stereoscopic support at all.
One more thing I wanted to add to the HDRP discussion is that its not just about getting nicer materials and lighting. For me it's all about getting access to TAA which is absolutely crucial for visual quality in VR. The HDRP TAA is so good that it's actually comparable to 150-200% supersampling at close to no performance impact. There is some ghosting of course, but it is very tolerable compared to either a massive performance cost with supersampling or really nasty specular aliasing with mulitsampling and FXAA/SMAA.
Without HDRP support, to my knowledge there is simply no way to get TAA with Obi in VR.
The postprocessing package for the builtin RP does have stereoscopic TAA in theory, but it is completely broken in multi pass mode which is needed for Obi. It gives a taste of how great it could look on left eye, but the right eye is full of horrible artifacts and afterimages. This was reported almost a year ago and still hasn't been fixed, if it ever gets a fix it's probably not anytime soon.
The URP doesn't have any official TAA, there is only a paid third party TAA asset. It actually looks pretty good and is more customizable than the builtin RP or HDRP TAA, but unfortunately has no stereoscopic support at all.