Keyboard is too stiff for me - any way to make it looser?
I feel that the keyboard of Mac (or here my main focus is actually MBP) is too stiff.

There is no reasonable way you can change the stiffness of a MacBooks keyboard. However depending on the model of the MacBook, the tactile feedback could differ. While the keyboard typing feel could argued to be subjective, a general perception is that the new Butterfly keyboards introduced in Late 2019 16&quot; MacBook Pro and then eventually in the newer 2020 13&quot; MacBook Pro and 2020 MacBook Air are easier to type on.
So if you are using one of the older MacBooks, you can consider buying a new one after you give the new Butterfly keyboard a try in a store.
Alternatively, you can also consider getting an external keyboard where you pick one as per your exact liking.