"Note that Intel paired this with a bug fix for the freezing during Prime95 - if you want the bug fix, you have to let them lock down your clock. "
Also you can try to separate the Prime95 bugfix from the clock lockdown. Good luck :-)
"While microcode can be updated through the BIOS, the Linux kernel is also able to apply these updates during boot."
-- https://wiki.archlinux.org/index.php/microcode
now, do you update your kernel more or less often than the BIOS?
I agree with the first part, but no with the second. I don't like manufacturers deliberately breaking products which have already been sold, especially in cases when the sale wouldn't have happened if the product weren't better than specified.
Today it's Intel removing not advertised features, tomorrow it'll be Sony removing advertised ones (or had they already done that?)
If it was advertised with no ability to overclock, you should assume it can't overclock and if you are able, don't assume it will work or will stick around forever.