For the few times you would actually want to touch the screen, I still don't see the benefit(s) of having an OS optimised for multiple input.
Also, plastering the screen with grease and fingerprints one minute and then using a trackpad the next is anything but professional.
Working backwards... how is touching the screen then touching the trackpad 'unprofessional'? I think you're using a meaning for the word that is new or unusual. As for plastering the screen with grease and fingerprints - you're doing the same thing with your phone. Maybe you just have hygiene issues?
As for why you'd want it, let's address this in three parts.
First, you don't have to use it. It's there when you do want to and when you do need it. You're also missing that the Surface (like the iPad Pro) has a pen.
Second, I'm assuming you don't own an iPad or any other kind of tablet and only use desktops or touchless laptops? Because if you do, then ask yourself - why? Answer - because *some* kinds of interactions with software are actually easier with touch - and some aren't. If you have a hybrid device like the Surface, you can switch modes and use which ever one is best suited to the task.
Finally - as a long time hybrid user, here's a little secret that isn't talked about much: when you get used to having a hybrid, it's surprisingly hard to go back to just using a trackpad or a mouse. Here's the reason - with a mouse or a trackpad, you have 'drive' a pointer to the right place to cause an action. For precision tasks - that's really the best way with pen being second best - touch doesn't really work well. BUT, for clicking on buttons - even on non-optimised screens, touch is simply easier. You're doing something your entire nervous system is wired to do - see something - touch it. Once you get into the habit, it's literally reflex. When I switch back to a regular desktop, I'll reflexively tap my monitor with my finger to click a button without even thinking (much to the amusement of my coworkers).
It's not an either/or.
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Microsoft keeps doing this in their commercials... When are they going to realize that Macs are less of a thread to them than the Chromebooks?
Maybe because fewer Chromebooks are sold than MacBooks (which is itself a very small number, compared to PC laptops) and most of the Chromebooks sell to the classroom/educational market which isn't a primary market for Microsoft?