Not calling you a lair, but that’s been all allowed at all of my past employers that I can remember. Sounds like an employer issue.
I believe Amazon does too, since they run into HCI/HCE issues all the time, famously having a low match.
Among a plethora of others. For me, this has been quite a few companies, not all of course, I don't backload mostly out of laziness using this strategy often, but its beneficial when jumping to companies with low matches partway through the year.
But the limit was very high. I recall setting the contribution to something like 80% or 90% and maxing out after a few paychecks.
But in general: I agree with you. Why should we only be allowed to do what my employer allows? As if them allowing me to contribute is some benefit they are bestowing upon me. Rather than them just being middle-men between me and tax law.