And if I am using a Mac, what do I care that the monitor doesn't work with any other laptop?
If you really are only using a single Mac then no, it doesn't matter... but these displays won't even work with current
My MBP is my main machine, used 90% of the time, but there is also...
...an old Mac Pro 1.1 stuck on Lion, with an ancient copy of Adobe Photoshop/Premiere/Flash on it that I sometimes need to open old projects, and (because its easy to juggle the discs) occasionally boot into Windows XP or Linux for testing/experimenting.
...a Raspberry Pi (2 actually - one for experimenting and the other is the DNS/DHCP server for my home network)
...a PC box which was a media PC running PVR software but I'm now using as a Hackintosh to try out Sierra and, long term, may use to run Windows 10 or linux
...an always-on Linux server with my backup drive and other shared, bulk storage. Mostly headless, but if it goes wrong or I'm tweaking it, a display is useful.
...my old employer-owned MacBook (DisplayPort only) which I don't use much but keep roughly synced with my main MacBook in case my main machine goes wrong.
I have 2 monitors on my desk, each of which is connected to 2-3 devices so I can display the output from any of those devices when needed.
Do I actually
need all of those devices? You might as well ask whether I
need a $3000 laptop when I could
make do with a $500 PC. Certainly, the next time I upgrade my main machine, some of them will be disposed of - but then I'll probably keep my old MBP around until its no longer useful, and might get a Raspberry Pi 3 or 4 (whatever they're on now) soon. I don't need Win XP for testing any more (Internet Explorer 6 can now, thankfully, be ignored) - but I'm still likely to end up with a main machine, a Pi, the server and maybe a "work" laptop if the main machine is a desktop.
So, yeah, if I lay out the thick end of a grand on a display I'd expect a bit of input flexibility -
which is something that almost every other midrange display on the market offers.
It is what has put me off from buying an iMac or the old TB Display (even when it was up-to-date tech) for years.