I'd have to do more investigations of the CS school here at U.T. Austin. I suspect that most of the Macs used are of 2015 vintage or earlier - the Mac laptops most students use these days still have the lit up Apple logo and multiple USB ports, SD card readers, and HDMI ports. These students need ports, not only for CS courses, but for S.T.E.M. courses they take. At the graduate level there is increasing need to have a Unix/Linux client to work with. Much of the higher level CS and other scientific/engineering research involves working with high performance workstations and computers, which at least at University of Texas facilities, often involves working with various Linux/Unix systems backended at the Texas Advanced Computing Center (TACC). Of roughly 12 (I think) different systems, the Stamped 2 is their latest and greatest. It is Linux based. Here's a link to it with specs:
https://portal.tacc.utexas.edu/user-guides/stampede2
If I was a CS or other technically oriented student working with stuff like this, I'd want either a Unix or a Linux based laptop/desktop client for simpler and more transparent access through a shell like bash. You can get that with a Mac (it's BSD Unix, easily apparent upon launching Terminal) or a PC running Linux. If you want a variety of ports sans dongles to use with your machine, you'll need either a Linux PC or an older Mac. Windows has recently introduced a virtual Linux kernel, of which I know little at this time. Incidentally, here's the kind of Mac laptop you can still get (2015 MBP) at places like Amazon. I'd seriously consider buying something like this, even though it's a 4 year old model. It just has all the ports I still like to have, and with MacOS / BSD as a system:
https://www.amazon.com/Apple-MacBook-2-5GHz-MGXC2LL-Refurbished/dp/B0784J8FXM?ref_=fsclp_pl_dp_4
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Which Macs are still common in your social circle? The newer models, or 2015 and earlier? There's a very large difference, except that they still run MacOS/OSX/BSD. If you go back 5, 10, or 20 years to substantiate the reasons to buy a Mac, that's just historical anecdote. Those older MBP's can't be compared to the newer ones for functionality. It is also not really relevant to compare PC's of 5,10, or 15 years ago to the current crop of high end PC's available. The newer PC hardware at the high end is of high quality and perform admirably, featuring ports and upgradability no longer available on the Mac laptops. As an old time Mac user, you just need to take a few months and learn how to install and use Linux (or buy a pre-installed system from System76 or Purism).