A built-in tuner does not automatically require a DVR function (though that would certainly be nice). A built-in tuner would simply let local OAR channels appear in some kind of cutting-edge, new Apple UI guide with the rest of the Apple chosen channels.
For example, I have DISH network. The box that receives the satt signals also has a local channel tuner option. Hook that up and the local channels mix into the channel guide. That all-in-one-place feature is much nicer than a solution of leaving the local channel access in a guide-less option by running the cable into the TV.
And if the problem here is the inability for Apple to strike deals with hundreds of independent station affiliates (because apparently only Eddy Cue can forge such deals at Apple

), an easy solution would be to copy the above: hook your antenna cable to a cable jack built into a new

TV and simply weave the local channels into Apple's guide just like Dish and DirecTV does with the same.
IMO, that seems much preferable to delaying until Eddy finds some time to give the hobby enough focus to strike deals with hundreds of independent stations around the country.