In my opinion, fingers are too big.

I need to do precise drawing work, like drawing electronic schematics or PCB layouts or other kinds of technical drawings.

I cannot imagine doing such things comfortable with a touchpad.

I have also not used a mouse for more than a decade, but that is because I had switched at some point from a mouse to a trackball and a few years ago I have switched to something much better, i.e. a small graphic tablet (having the size of a mouse pad) used in mouse mode, a.k.a. "Relative" mode, instead of in its default "Absolute" mode.

With a sharp stylus, I can point much more precisely than I could ever do with my fingers. I can also move the cursor instantaneously to any part of the screen, with a minimal movement of my fingers, because the velocity of the point of the stylus is much greater than I could ever achieve for the tip of my finger.

Moreover, the position in which I hold the stylus is more comfortable than if I would have to put the finger on a touchpad and the movements of the fingers have a smaller amplitude than required by a touchpad, which also improves comfort. (To reach any point on the screen, only the 3 fingers holding the stylus have to move, no hand movement is necessary.)

So from my experience, a touchpad cannot compete with a stylus, neither for accuracy, nor for speed, nor for comfort. (With a very light stylus, like from Wacom, also the transitions between touch typing on the keyboard and using the graphic pointing device are much faster than with a mouse, because touch typing remains possible with the stylus between the fingers.)

A touchpad may be fine for text manipulation or Internet browsing, but for drawing, it is too slow in comparison with a mouse or trackball, and even more so in comparison with a stylus, while the devices that are better for drawing can also easily accomplish the simpler tasks for which a touchpad is acceptable.