"smooth scrolling" with a mouse or keyboard like you mentioned is a lie. Its animating movement but is not precision input at all. its "smooth" sure but you have zero control over the actual scroll (i do wish zed did this too its genuinely useful as an accessibility aid because it lets your eyes follow where the cursor ends up for example but yeah its not the same as having proper precision input for scrolling as you do with a touchpad). I do agree a mouse is far better at precision input wrt pointing at things but when programming,,,, you do not need to be so precise with cursor movement. you're editing text which is largely keyboard centric, and the time offset between moving your hand from a mouse to a keyboard on a desktop is in my opinion far higher than it is to move your hands from a keyboard to a touchpad surface. Not to mention you get actual precision with scrolling with a touchpad. I personally keep both a proper MMO mouse with a dozen programmable buttons on my desk, and a apple touchpad with precision drivers for normal use.

also wrt scrolling, mice like the logitech mx master actually have what is in my opinion a much better solution where the scrollwheel is not stepped and has scrolling inertia, allowing you to have the same level of precision with scrolling as you do with a touchpad (im not sure if the vertical wheel on it is the same but regardless). Its in my opinion a similar jump in capability for mice as continous triggers were for game controllers. Something that must have been initially quite notable, but slowly became expected behaviour (except on the switch for some reason but whatever i guess)