I was experimenting with my trackpad and it actually does click at the top right and left, but not top center (though, it will click about 1/2" down from center). Those top corners do take considerable pressure compared with the bottom of the trackpad. I never noticed it before, because I'm used to clicking at the bottom of any trackpad [with my thumb]. It it obviously hinged/mounted at the top area of the trackpad. It's just the way it's built. Yes, the owner's manual does say "anywhere", but to me, common sense says "they" probably expected people to use the trackpad in a similar fashion to the separate button - i.e. towards the bottom. I'm not trying to apologize for Apple, except to say they probably should change the wording. I'm just saying the general usage would be to click somewhere in the bottom half.
If you have tap-click enabled, just try and remember to use it. If you find the trackpad resisting, it's moot since you've already clicked with tap-click. 😕
There seems to be some variance in the pressure needed to "click" the new trackpads. Perhaps your's is stiffer than most, but in any event trying to force it to the point of breakage might be considered abuse and not be covered under warranty.