The problem is people are making a LOT of assumptions about things Jenson has said, problem is he's just an excuse maker.
The only car that really talked about heat in tyres afaik was Ferrari pre/early season, and BOTH cars had serious trouble, at the testing preseason and the first races the two Ferrari's were all over the road, off the road, struggling in every single corner, they clearly had no grip, and they've seemingly fixed it.
Button has complained about things no one has seen. he does laps with no mistakes, he's not fighting the car hard to keep it on the track like we saw Alonso doing, Hamilton has had zero issues, Button is simply an excuse maker.
Discount the excuses he comes up with, and I don't think it's even a problem. Just about every single car out there(except for Jenson supposedly) is trying to save tyres, which generally means, keeping temps down and pushing less hard. So 23 cars are going easy in corners to keep tyre temps and wear down.... but Jenson is only slow because he can't heat the tyres up, complete rubbish. As for locking up, he's had plenty of lock ups this year in earlier races without the "new brakes" and sorry, if a professional racing driver who is making what, 5+mil a year can't adjust to new brakes within one testing session, let alone 2 entire race weekends.... he's either completely and utterly incompetant or it's an excuse.
Now he's making another excuse, which is essentially, the fan's don't like it, unpredictability is boring, let me have an easier car to drive again that makes me look less bad. At least that's how it sounds to me, because boring and unpredictability don't go together, completely predictable and boring go together very very well. yet another time Button is saying something that defies both logic, and everything we can see from every other driver.