You can fill in the blanks...
It is not about
adding new features to products, of course that usually increases cost. That's Biz.
But currently, with the additional costs added for memory and SSD's (Apple may or may not had a choice about) MacBook Pro just had an increase, but not as drastic as lets say Mac Studio. So, Tim probably balanced the price hit so customers get use to it before another increase when the touch comes out (opinion). Mac mini got another $100 on base and Studio got another increase, but with no really new features (unless you consider accelerated cores etc. new features) but performance increases as usual when the next update comes out. Touch screen will increase MPro prices again, which would be another big jump over the last few months.
"If" it is a new product like an Ultra,
then no problem with touch screen (you seem to just select my comments without reviewing everything that was stated to make your points - I mentioned "no problem"with touch screen earlier). If the touch screen is
only on a new Ultra fine (giving buyers a choice), but like a 16" MacBook Pro Max, probably the costs will be more than assumed
and it seems the Pros I have talked to really don't care for it. Windows cross-overs seem to desire it (and that is ok).
Unless you are "beta testing" the new Ultra or touch screen Mac, no one really knows if Apple "might" have a separate modified OS for touch. You can educate me on it if you are testing it or maybe I missed some article or two about it (I do on occasion). 🤔