I think it's also important to note that for many employers, they're not that reasonable.
You're really lucky if you can say "hey, I am diagnosed with X, and I need Y to continue working to the best of my abilities, can we sit down and talk about reasonable adjustments" and they say "of course, we will implement XYZ ASAP"
It's really not like that with many employers.
I've had to have countless meetings where they come in and objection handle, blame you, make you recite ridiculous scripts about how what you're asking for is going to negatively impact everyone (even though in my case it was a contact centre that employed thousands so really wouldn't have made a difference), make you feel immense guilt, meetings, requests for highly personal information, fannying about delaying any requests for an occupational health meeting because they don't want to pay the fee, absence meetings if you have to take time off due to your disability and because of their inaction, the added sickness that comes with the stress of having to simply fight for your right to have reasonable adjustments at work, and often the additional fees of seeking legal advice.
In my first position I needed a specialised chair and a desk that could stand or sit due to a clotting condition I have that has nearly killed me. I jumped through all the hoops, got access to work funding, passed on the relevant information to my employer and I still never got that equipment. I was employed by them for 6 years. It really should have been sorted within months. Instead I kept redoing my access to work application and they kept on dillydallying about getting anything sorted.
In my second job I needed reduced hours because of my disability but couldn't because others already had reduced hours for childcare purposes, and had to get all the way through the appeals process before they conceded that there was more that they could do as a multi-national organisation to accomodate my disability, but still sanctioned me when all became too much to cope with full time in the interim.
So if a colleague does get reasonable adjustments made for them to level the playing field, don't just assume they've been given to them on a silver platter because the chances are they haven't. There's a lot many employers will say is too unreasonable when actually the requests are very reasonable.
Disabled colleagues don't need envy making their working days harder.