Same here, mine has been running overclocked to 5ghz for about 10 years (?) now and I refused to upgrade it by quite a few "lakes". Sure now it's getting pummeled by hugely multicores newer processors, but for a long time, it was top of the range.
The trouble is that Intel's rollout of the future has been shambolic at best. Potentially revolutionary extensions such as TSX and SGX failed. It is still too early to require AVX-512 which could speed up and reduce power consumption of your web browser since many of Intel's "latest and greatest" client CPUs don't support it. (Don't buy the false claim that AVX-512 is a power pig: sure it will consume a lot of power running at full clock because it is doing a lot of work... AVX-512 helps "atom class" processors quite a bit because it avoids instruction decoding which Intel is bad at.)
It's not clear that Microsoft's new line in the sand is going to buy them very much extra functionality for Windows.
Isn't that also the #1 reason not to upgrade? In other words, is Windows 11 compelling yet? As of now, mostly I just hear complaints, and ocassionally tidbits about better scheduling for newer chips with multiple core types (which is compelling, but only if you upgraded)
*Good lord, has it been 3 years already?