Wow, I think you're right.
I have 3 Mexican Design keyboards and they feel very mushy. I have 6 Thailand Design keyboard and they feel sharper and more clicky.
Of course if you want a good tactile keyboard, nothing beats the Extended II. The original "Apple Keyboard" ADB is also nice, as well as the keyboard that came with the IIGS, and the Extended. They are all Alps if I recall. The Adjustable was also Alps I think.
Apple Keyboard IIs feel mushy.