A cheap mouse allows finer and faster control than the best touchpad that currently exists, so... I plug in a mouse. (Don't believe me? Play an FPS game with touchpad against a mouse user.) That said, Synaptics touchpad support on Linux is bad. In my case, it's the touchpad on a Thinkpad T440s. It can run in a legacy/standard protocol mode or a "modern" protocol mode. Linux supposedly supports the latter (where palm…
Item 1: It's undeniable that the mouse is more precise, but it tethers you to a desk. One with enough space for a mouse. Not always feasible. Item 2: You're mentioning Thinkpads. Try a touchpad on OS X, then come back. The difference is enormous. You can actually use the GUI without a mouse and without being annoyed, it's the only laptop/OS combination where that works.
For sure the materials used on the MBP are of higher quality and if I had one complaint it would be that smudging on the T480 trackpad is noticeable where it is not on the MBP. With that said, if you are running a modern distro that has proper driver support then I think the trackpad on the T480 works really well and you will not find the difference to be "enormous".