I like the touchpad. Is there any competitor which is as good and exact? I noticed in Linux, it's not as exact.

Thinkpad touchpads are mediocre at best. Dell’s are a little worse than that IMHO.

I don’t understand why other laptop manufacturers don’t copy the Apple trackpad.

I have Lenovo laptop with quite mediocre touchpad. I got used to use gestures instead of clicking and it works great for me.