For vertical screens, there’s really limited benefit to having touch, but a lot of detriment with cost, and some detriment to weight and thickness. Touch makes the most sense for handheld devices. Sure, a laptop could fold back into a tablet. But when a device gets to a certain size and weight, most don’t want to hold it anymore. There are some instances where one would want to but it becomes very niche. And if you’re putting it down on a table, the trackpad is simply the most ergonomic way to interact with it.
I’m actually one of those niche. That’s why I got a 12.9” iPad Pro. But it wasn’t for touch. It was really only so that I could use it with the Apple Pencil. Otherwise I would have gotten a light MacBook. I know some people enjoy the 12.9 just because they like having a big touch screen tablet, but I can’t relate to that. The only use case that I really appreciate it being touch is comic reading, but that is very rare for me. Even internet browsing, I would rather set it down and use a trackpad and keyboard, or use a smaller device that’s comfortable to hold (as long as the website can adapt formatting for the smaller screen). To be frank, I don’t find it comfortable to hold any device bigger than my iPad mini for long periods.