Onward isn't licensing every single one of Microsoft's computer peripherals. Some classics, like the Intellimouse or its modern iterations, for example, don't make the Incase reboot list.
That sucks - the Intellimouse Pro from a few years ago was a fantastic mouse.
Because Windows doesn’t support OS-wide text formatting/manipulation like macOS does.
The system already existed in macOS so it was easy enough to plug writing tools into it, but to do the same in Windows would mean completely rewriting how Windows handles text display and editing (and no doubt causing an avalanche of compatibility issues with old apps).