I pretty much agree with Jack Burton that Apple's conception of the target market is FCP and Logic users - they are specifically trying to satisfy the highest end of that market (people working with multiple 4K streams, 4K with intensive effects or 8K in FCP, and people making complex compositions in Logic).
In addition to that market, they are interested in the top end of the photography market (~50 MP cameras are easy to come by these days, and they like plenty of RAM and CPU power). They are also interested in the video market even outside of FCP - they are certainly happy to cater to Premiere, After Effects and Resolve users (etc.).
One factor driving power requirements for photo and video folks is the rapidly increasing size of image files. My still camera shoots 8K time-lapse. Right now, that statement narrows down the still camera I own to two models, my Nikon Z7 or its close cousin the D850 - but several more are either coming or already here and will gain 8K time-lapse in firmware upgrades.
There are five 40 MP+ still cameras on the market (not counting a number of more specialized medium format models) - the two Nikons that offer 8K time-lapse as a side feature plus models from Sony, Panasonic and Canon. Any of the five are under $5000 with a high-quality lens or two, plus a couple of batteries and memory cards. Any one of them will chew your computer's storage and processing to bits, and medium to high volume shooting with any of them is a Mac Pro use case.
As of now, 8K full motion video is extremely expensive to capture! The only shipping 8K camera I know of is a RED that costs at least $50,000 once it's got everything it needs to capture a clip - RED likes to sell things like a shutter button, a lens mount and a battery connector as accessories. Be careful what you wish for from Apple! How would you like a Mac that you took out of the box with no GPU, only a proprietary connector with a sticker on it that said "Apple GPU module goes here"? Oh, and not only would it ship without an SSD, you also need to buy the SSD mounting plate separately. No RAM, and the RAM slots are optional - that's how RED sells cameras. There are several more 8K cameras coming out for much less money, including a couple of $5000 models, and I suspect 8K capture will become a standard in the next 5 years - watch out, slightly creaky computers!
Windows is NOT objectively better (neither, necessarily, is Mac) for any of these things. Windows certainly has major advantages in available hardware configurations - you can buy pretty much anything you darn well please or build machines with exactly the components you want. On the other hand, Windows still requires significantly more work to maintain, is more vulnerable to malware, and is not as sophisticated at color management.
There's also a significant "devil you know" advantage in each direction. If you're an independent photographer, videomaker or musician (or in any other creative field), you are probably your own IT department. Whatever you have, you'd probably rather stick with it than switch, since you would need to learn the other OS, including basic maintenance... I've personally been using Macs for 35 years (yes, my first Mac had 128K of RAM), since I was 12, and I've just evolved in my ways of doing things on computers