I'm a heavy Terminal user and run everything from local LLMs to full stack dev (react/python). I dibble and dabble in Blender, Unreal, and Logic Pro. I aimlessly browse the web looking for recipes, 3d printing files, shopping, HN, whatever. I'll occasionally spin up Age of Empire II locally or play some quick games via GeForceNow. I'm in full control of my Synology and Qnap NAS servers and the shit ton of media that's on it.
And I do all of that on my Mac. My 4090 rig is strictly for gaming with my son and my Proxmox Linux retired thin client rigs are for running my household on HA.
Please tell me what I'm missing out on by using a Mac OS device as my daily driver.
You're probably happy. That's great.
If you read the rest of this thread you'll see specific examples others point out.
The specific examples in the thread, AFAICT, are about iOS, not macOS, and the person you're responding to specifically mentioned Macs. It's very hard to find examples of "things you cannot do on an Apple Silicon Mac due to Apple-imposed restrictions that you can do on a PC" that aren't pretty esoteric. (Unless you want to argue that the inability to plug in a better third-party GPU is due to Apple-imposed restrictions, which is debatable but defensible.)
If you read my other comment, you'll see Mac specific examples. Examples from my own experience over multiple years.