Touch ID is meant to be a convenience layer that makes security more convenient. It is supposed to be easier than entering your password. On iPhone this worked, because the Home button and Touch ID sensor were one in the same. So the very act of picking up your phone and waking it up by pressing the button simultaneously authenticated.
On the Mac, this is not the case. Reaching for the Touch ID sensor is a bad user experience. You should not have to take your hands off the keyboard or the trackpad. As it is, I've eschewed unlock with Touch ID in favor of unlock with Apple Watch, because the latter is automatic and effortless.
The worst, however, is Autofill in Safari.
On a Mac without Touch ID (like my iMac), when you click inside of a form field and your Autofill options appear....the correct and natural behavior is to click one, and it gets inserted into the fields.
On a Mac with Touch ID, if you try to do this you've done it wrong. The "correct" way is to mouse over and highlight the Autofill selection, but whatever you do, don't click it! Stop there is the right selection highlighted, then reach up and touch the Touch ID sensor. Now it gets filled. This. Is. Terrible. They thought they were saving a step, but all they did was make it completely unintuitive. So unintuitive that you will continuously do it wrong forever.
Face ID is the way forward here. The MacBook has the ideal design for Face ID...plenty of space around the FaceTime camera, which is always pointing toward the user's face during normal use. Just like when looking at iPhone, Face ID would just work any time it needs to, and it would not disrupt your workflow.
I'm also in favor of more Apple Watch authentication, but I realize that is not a built-in solution.