Alder Lake 12900, M1 Max and Threadripper are parts that 99% of PC users don't need and aren't going to buy. Top performance does provide bragging rights and is useful for some people. Usable performance in mobile is PPW. Performance in desktop varies.
Those three are very different products in very different categories.
The 12900 is a mainstream consumer chip. Many people – gamers among others – will seriously consider it, but most of them will choose either 12600, 12700, or an AMD chip. While ultra high end gaming is affordable to many, cost-effectiveness usually wins.
The M1 Max is a niche product, but only because it's a Mac-only ARM chip. An x86 chip with similar specs would sell like crazy, because a lot of people would buy it for their gaming laptops and midrange gaming desktops. The GPU is far from the fastest, but it's competitive with the current console generation, and you could easily make quiet small form factor devices based on it.
Threadrippers are weird. They are not true workstation chips, but they are not consumer chips either, but something in between. I might be in the target audience for one if Apple doesn't release cost-effective desktops with a few hundred gigabytes of ECC RAM, but I'm clearly in the minority.