I'd assume you'd be right, but anecdotally I am really surprised walking around my office how many people have their MacBook Pros connected to an external monitor -- and have the MBP open, typing on the internal keyboard and using the internal display as a second monitor. I've seen more than one person with two external monitors and still do that, so they have three monitors total. I don't know, to be fair, how many of them are actually using the Touch Bar; most folks use Visual Code, which I don't think does anything with it. (I am a technical writer still using BBEdit for reasons I should eventually write a dorky blog post about, but BBEdit doesn't use the Touch Bar, either.) Personally, I think it's a really neat experiment that turned out to be a solution in search of a problem.

(For what it's worth, I have one external monitor at work and run my MBP closed, with an external keyboard -- up until last week a Matias "Laptop Pro" mechanical, but ironically, the Matias developed a seriously malfunctioning key before the butterfly keyboard did. Currently I'm using a "full-sized" Magic keyboard there.)