Why include them? Because in my opinion, it makes both guns better. I love my M&P but I hate hate hate HATE HATE HATE HAAAAAAATE the stock hinged trigger.It just depends on whether you are a Glock person or an M&P person. You already know the answer for you, so the question is just designed to start a Glock vs. ____ discussion.
I'll pose a question back at you -- why involve an Apex aftermarket trigger? Needless complications imo. Get one or the other and learn to shoot it....