The reason would be more interesting than just stating a fact.

The screens get dirty, I find the build quality to be in general worse (perhaps with the exception of the microsoft offering) than the alternative, they are too light, half of them do stupid things like switch between tablet and laptop and bend in ways they shouldn't. I feel touch is more suited to a tablet.

Edit:

I also find that the keyboards are often neglected in 'touch screen laptops'

Screens only get dirty on glossy displays, for the most part (unless you have outrageously dirty fingers), build quality is pretty arbitrary since, much like normal laptops, good ones and bad ones exist. I don't know what you mean by "too light", but I can at least agree with the fact that Windows 10's "tablet mode" is a load of crap. It's a much better experience with recent Linux machines, where their GUI is optimized for mouse, trackpad and touchscreen navigation. No need to switch modes, just reach out and do whatever you want. Keyboards though? You might not be looking hard enough. I've got two touchscreen Thinkpads that feel equally fantastic to type on as they do to swipe on. I feel like you're grasping at straws a little bit, here.

I can't confirm any of this. I've had 0 keyboard issues or screen issues.

Asus, windows 7 and 10.

Laptop is 7 years old.

My biggest surprise is how often I use the touch screen. I'm typically a mouse and keyboard guy, but when I'm on an airplane it's sooo easy to tap.

Didn't know Apple doesn't offer touch screens, kind of shocked given how Essential they are to me.

Huh. I went out of my way to buy a 2in1 touchscreen laptop despite not using the 2in1 feature precisely because I know the manufacturer has designed the hinges and casing to be stronger for that use case, so that it doesn’t break easily.

Avoid random Chinese Celeron based 2in1 and you should be fine.