I'm a Software Developer in a ~1k employees company here. I've recently tried to ask my employer to buy me a nicer, mechanical keyboard -- I currently work on the cheap membrane Dell keyboard that came with the PC. Although my boss said yes, I had to go through IT, which promptly denied my request for a $50 keyboard (their "standard" is $25 for keyboard + mouse). They said I was welcome to procure my own keyboard and bring it to the office, however.
So I would like to ask HN: does your employer let you choose your workstations and accessories? Is there a set budget? Saying the name of companies that do let employees pick their hardware would be very helpful too.
(What laptop is within reason for a data scientist and for a copy editor is somewhat different, but I haven't heard of anyone having their requests rejected - we each were hired with the expectation that we're capable of acting like mature adults.)
Compared to a salary, a disability claim, or just the plain loss of productivity of an employee who's out sick with back pain or can't type easily because of RSI... even high end equipment is totally worth it for any sane company. IT has probably already wasted more of your salary in time spent discussing the matter than it would cost to just buy the damn keyboard.
That said, in companies with a dedicated IT function, IT is usually considered a cost center and has strict budgets for things like workstation hardware. You may do better to figure out what the real objection is on their end.