I suspect you're just tired of THANOS, but Happ threw his 2 seamer 5.7% of the time in Pittsburgh (with great success) - about half as much as he was in Seattle and almost 3 times less than he is this year. I suspect the 2S is his 3rd or 4th best pitch and thus there's certainly an argument to reducing it's usage - complete with evidence to support it.
The same argument can be made with Stro's cutter and change up. Are they useful pitches when used/thrown properly...but when they are your 4th and 5th best pitch - sometimes less is more (you also have to consider how frequently he can throw them properly and/or if they've found the best sequencing to use them properly).
Finally, let's not compare Happ's 2 seamer to Doc's and Webb's please.
E: I have no idea what THANOS is talking about with his muscle confusion bit...