More importantly: this isn't hard. They did it in Windows 3, an OS that had an 8MB install size and required a mere 2MB of RAM. That we can't provide this functionality in 2021 with all these supposedly highly skilled software "engineers" who consider themselves so ridiculously productive because of all the complicated abstractions they use, on hardware that is several orders of magnitude more powerful than was available to Win 3... well it's completely ridiculous and we, as an industry, should be ashamed.
Technically Windows 3 required only 384KB of RAM... Windows 3.1 required 1MB (in Standard mode).
Are there particular ones that are missing when it comes to dyslexia?
So what I'm understanding is you're saying an OS that is used by a LOT of people, is inaccessible, but you neither have any of the disabilities nor the OS you're complaining about to back this claim up?
Because macOS has tons of accessibility options including font sizes, etc.
Maybe Microsoft/Apple are big enough that they can (and should) handle it, but I wouldn't generally expect this type of gold plating.