In other words, how much of Macbook's trackpad is in it's software?
A tonne. Compare how the trackpad acts in the restore system, and how it acts in MacOS: Two very different realms of quality.
Regardless, lenovo & dell's (x1 & xps) trackpads are on par with the macbook '15's trackpad. Apple has lost that advantage.
There's also long term vs short term effects. Your personal preference might feel great for you right now, but will lead to joint and back pain 5-10 years down the road. While the 'correct' way may feel highly unnatural right now, but may very well save you from much pain and anguish at some point in the future.
However, when I switch to my old Macbook Pro 2013, they keyboard feels so much nicer to me that I feel frustrated with my purchase.
Just disable the mouse in your vimrc, you'll be better off for it.