As a primary/only mode of use: oh hell no, it's awful. It's too far away from your hands, the ergonomics suck.

As an occasional "pinch to zoom that thing centered on my fingers, and adjust it to show what I want to someone 10 feet away" tool: it's fantastic. I could learn the key combo, but "use two fingers" is dramatically easier to remember and control.

Or to guide someone through something on screen, you can just tap it rather than having them mouse to precisely the control you meant. (yes this is often a terrible idea for teaching, but not everyone has fine motor control and sometimes there's random interruptions from other software - having them push those away can make it harder for them to learn/remember the actual goal)

Or for signing your name on a document, or anything else even slightly related to drawing.

Or if it's propped up on your chest in bed and your hands are naturally more comfortable on the screen than the keyboard (which is far too close).

Or if it's dark or you're at a low angle and can't read the keys.

It doesn't cost much, doesn't influence the display much, and is very useful occasionally. A great hardware feature to have IMO.