and how long that took from apple to introduce a pencil... which is a quite old technology though... samsung made it to be real 4 years ago with SPen.
if you are working cad or any similar programs or designing you would appreciate the mouse input. unless they offer something else mouse cant die or macs will vanish...
Except it isn't, Apple have gone to greater lengths to ensure accuracy with the Pencil than Samsung did. I've had two of Samsungs stylus devices, neither of them have offered up the precision of the Pencil. I'm not saying they are bad, they're not, they just aren't as good. To me the Samsung styli are just that, a stylus for general interface work and a bit of writing. The Pencil on the other hand is, well it's a pencil, it's excels in proper work rather than being a general purpose stylus.
I need absolute precision in my design work and the iPad Pro/Pencil combo offers that in spades. It's a great tool to work with.
Hell, I've even started using the Pro and Pencil combo in conjunction with my Mac so that I have that brilliant Pencil precision in my desktop apps.
As for mouse use on a desktop, well, that's a preference thing. I absolutely hate mice now and when I'm forced to use one, on someone else's system, it just feels dated and old fashioned to me. I miss all of my gestures and force touch that I get with the trackpad on my Mac.
And I've certainly never had trouble using it for pinpoint accuracy. That includes cad/3D modelling/vector/video editing and a whole lot more. I've been using trackpads and styli for a long, long time, they are my preferred input options and it is just a personal thing, I wouldn't dare suggest what someone else should use as their input method of choice.
So no, I personally wouldn't appreciate a mouse. I'd probably throw it at you if you handed me one

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You have to understand the Apple user mentality here - if Apple doesn't offer it, it's not needed and no amount of common sense or personal preference will deter the rationalization against it. We saw the same thing when the original iPhone didn't offer cut and paste. There were many people here scoffing at the need to include it and lecturing us on why it wasn't needed. Now it's the best cut and paste in the universe! We didn't need big screens - only a dumb Samsung user would hold a freaking phablet to their head! Now the 6+ is awesome. We didn't need pencils or physical keyboards either. Now they are awesome too. And if Apple ever does offer mouse/trackpad support, these same people will be crowing about how much better it is than what is available on Android or the MS Surface.
Hmmm, I do see where you're coming from and there's no doubt that there are those who adopt a stance much like that you describe.
However you're overlooking the fact that some of us don't just think whatever Apple offers is best regardless.
Personally I've been using keyboards and styli on my iPads for years from Adonit, Wacom, Logitech, Microsoft and a whole host of others at prices from a few bucks to well over a hundred. And that's just the iPad accessories, I'm not counting the other ones for other devices, just a direct Apple device comparison. (Incidentally, always hated the keyboards, but that was more to do with the cramped nature of them. The 12.9" Pro has improved on that just by being larger.)
So having used, for example, so many styli for so long I can very easily compare the performance of the Apple Pencil to, well basically all of the other "good" ones available for iOS. There's no doubt about it, Apple wins by a country mile. But then they should, that have the advantage designing the hardware and the operating system. If they can't make a best in class input device like the Pencil, there's something very, very wrong.
I'm sorry to say that that "Apple mentality" can often just be that one is well informed. And I'll happily sing the praises of any other manufacturers when it's justified.