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I'd say a lot of it is simply due to manufacturing tolerance.

Machinery to build the keyboards gets used, tolerances drift (still within "spec" but one end or the other) and then the production line gets re-tooled once it is at the edge of spec and repeat.

I'd say that's likely far more to do with the observed differences from machine to machine with the same base design than anything else.

I think tolerance and multiple manufacturers definitely factor into the equation, whether or not its more the former or latter I dunno but does seem with M3/M4 etc. they are going with something that has a little more rattle when touched on the surface but not depressed, and tighter feeling than previously being a little squishy (without too 'airy' for lack of a better word). If that was on the extreme end of either, I would be miffed.

Peoples' perception / personal tolerances may factor into it, but I suspect people in this thread got some units I also would not be ok with. If anything, I suppose it's kind of fun to have two Macs in different sizes with different feels considering I think I can put up with both (and have 'put up' with what the 15" M2 is offering up until this point)
 
I highly suggest to just use an external keyboard. Night and day better than any mac keyboard.

I don't get why Apple just doesn't put the magic keyboard that they sell as a standalone keyboard, into their MacBooks. There's no need to make something so simple so complicated.
 
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