I wouldn't use a pen on a phone - but on a tablet yes.
My mother is an architect and has a Lenovo Yoga with, uh, I believe it is, because I've tried it once, a touch screen. She never uses it (the touch screen). But yea, this model can flip around and turn into a tablet so you can touch it and even draw on it with a pen. It's really a very good concept. But she does not use because a) she is 50 yrs old so not used to new tech and b) she prefers to use mice and keyboard, it's her workflow anyway.
If the MacBook had that, I could design my sites on Adobe .X.D (the forums convert the name into an emoji so I have to put something different) a bit faster than I do today, it's just a matter of adapting to a new workflow. I am actually testing this idea with Vectornator on my iPad Pro to design the new version of my own site.
My previous post was talking about having to carry around a wacom tablet with the MBP for more design/art work than just web design. If I had the option to go with a touch screen MBP with similar usage like the previously mentioned Lenovo Yoga, then I'd go for it. Wacom tablets are definitely good but not having to carry around 2 big devices with me is just a win situation.
But for a desktop iMac, for sure you should get a wacom tablet for that kind of work; I don't think touch screen should go on iMacs, but MBPs sound reasonably good for certain professionals. I've seen on youtube several iMac concepts with a touch screen that would definitely work in certain situations but not my case. For example, I've seen one where an engineer was designing a car chassis.
EDIT: For POS (Point of Sale) I think it might be relevant to have a touch screen mac.
"Design isn't just what it looks like and feels like. Design is how it works."
JOBS, Steve.
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