It appears if you remove the SteamVR, the ‘BP_Motion Controller’ blueprint fails due to no longer having the ‘Steam VRChaperone’ Object Reference. You can remove it but, your controllers are no longer tracked and lay at 0,0,0 with all mapped inputs still working. Adding Steam VR does not add back the parent class having to use my back up, or deleting it and adding it back.
Normally this would not be a problem, but I have found Microsoft WMR OpenXR worked great in Unreal 25.3. Performing better and allowing the HP Reverb G2 to have full resolution. Also, in 4.25.3 OpenXR worked great on Oculus and WMR, but with SteamVR, ‘Post Effects’ were turned off.
Anyone else finding similar problems using OpenXR?