Agree. If I'm paying for NBC, CBS, FOX, ABC I deserve to get ALL of the programming on those channels, not simply just the show I'm watching.
1) American commercials are more current, sometimes topical, commonly informative, and frankly more entertaining. Contrast that with Canadian ads which are known to be highly repetitive, not informative in the least, and staggeringly boring.
2) Simsub cause issues with PVRs because of the delay usually introduced by the SIMSUBing Canadian channel, sometimes upwards of a full minutes delay. This can throw of the finish of a show, where in it should end at 8:30:00 on the dot, the Canadian SIMSUB delay forces it to end somewhere between 8:30:00 to 8:31:30.
3) Audio quality is usually downgraded from a type of Surround Sound to simply Stereo
4) Visual quality commonly degrades
IMO, Canadian providers offering packages with "American Networks" in them are baiting and switching the product. They wind up becoming duplicate version of CTV, etc. during prime time.
Moreover, the Canadian providers are their own worst enemy when it comes to cord cutting, because I believe that SIMSUB'd content is one of those very subtle but still very responsible reasons that many Canadians continue to cut the cord.