No reason not to use disc hubs with rim brake rims. The narrower angle on the non-drive/brake side means the rear wheel can be built with less 'dish' and is therefore slightly stronger. Front wheels, however, will have a small amount of dish that would not be there on a rim-brake-only hub, so the front wheel will be ever so slightly weaker.

Another advantage of disc hubs is that the wheels may be compatible with a disc frame if the rim-brake frame or fork needs replacing. Newer bikes have thru-axles that are less common on rim-brake bikes, so don't assume you can easily swap in the latest and greatest frame, but you definitely have more options than with a rim-brake-only hub.