Taps
The "MacBook Pro with PROLED XDR Display" (yikes) introduces a number of features, but the most divisive is touch. In no particular order, several perspectives.
Like the HomeView and iPad, but unlike the iPhone and Apple Watch, there's no haptic feedback from an in-display Taptic Engine, which would likely add way too much thickness to the product; the display is also big enough that the feedback wouldn't come from the right place. As such, all feedback must come from the UI rapidly updating visually.
Windows and other OSes usually shuffle around UIs and grow/shrink elements to adjust the tap target sizes. The target size is bigger for a menu you pull down by tapping, but energy seems to have been spent a) not changing the default proportions and b) not making the UI dynamically relayout/reflow.
Touch gestures are set up to be close to the trackpad gestures except when the direct manipulation demands another solution.
Apple's official guidance also says to de-prioritize complete iOS gesture compatibility below having gestures that make sense on a Mac.
A recurring loose rumor has presaged a foldable MacBook in the sense of a chonker iPhone Duo, with a display that extends down the keyboard. While this is now technically less distant than before, and having touch support would be a necessary step, I don't see this as Chekov's gun.
Touch has the feel of a feature that is implemented well, and reasonably and thoroughly integrated (revisited hinge included), but also a nice-to-have feature for limited scenarios. If there had been no other touch laptops out there for the past 15 years that people had gotten used to, and it wasn't one more feature to either lose to in a PC head-to-head, or use to pad the functionality delta for this particular product, I'm not sure they would have even done it - clearly they were in no hurry otherwise.
The oft-touted "your arm wants to fall off" has always been an argument from human physical constraint, but predicated on it being a major way of interacting with the Mac. The reasoned pushback to this has always been: well, okay, but if you want to use it for something occasionally, that would be fine. Apparently, Apple now agreed enough to do something about it.
It says something that the absolute strongest argument in favor of touch (aside from "so that people who think every display ought to be a touch display are not confused or disappointed") is "so iOS development, iPhone mirroring or iOS-on-Mac apps will work much better".
All-in-all, a much better evolution than the Touch Bar. Things were added, nothing was taken away and everything is optional (you can turn off the touch substrate completely, at which point as long as you're not dependent on the exact previous behavior of the now-tweaked hinge, you're probably not even going to notice).
The nano-texture option seems to have changed to be more similar to the iPhone Duo's implementation than to prior nano-texture offerings. It is now described specifically as a different nano-texture glass at the top, while for the regular MacBook Pro it is described as a nano-texture display, possibly involving different decisions across the display stack. Possibly this has to do with the layering of the oleophobic coating and the touch substrate.