I don't think you can say that. Windows 10+ has a tablet mode that is completely detached from desktop mode, and it's a global toggle. Switching on tablet mode brings full-screen, upscaled, simplified explorer and settings, and switches off the classic desktop launcher with paper bin, shortcuts, etc. in favor of a larger "Start"-type menu launcher. What deeper and experimental integration there was in Windows 8 had just been removed as it became clear MS couldn't quite sell into the iPad/Android tablet market or compete in terms of power management. After stripping most of Windows 8 innovations, what remains is a touch keyboard, touch mouse emulation, and a few affordances in explorer to make tablets not outright terrible, with the target audience education and mbas interested in mobile powerpoint and web/mail.

Windows 10 had a tablet mode. Windows 11 does not - it just appropriately scales up the padding and size of some UI controls to make them easier to tap.

I’m failing to see where there’s some kind of downside here. What you describe doesn’t really sound like a bad experience.

You cant figure out how those kinds of requirements might influence or curtail development in the non touch parts of the system?

We saw the same thing happen with mobile first on websites.

The introduction of the mouse led to developers paying less attention to keyboard shortcuts and function keys, but I don’t see anyone seriously saying computers should not have mice.

Or for that matter, that adding support for game controllers (something that has actually happened with Linux desktops) would led to curtailed development of non-controller parts.

Have you found some kind of performance or other detriment of the mere support of touch screens or is this just theoretical?

It's a fine experience. It's not what Apple is doing though. Apple is doing the half way experience that will leave all unhappy.

Sounds like touch screens on laptops are so great! I sure am excited about the future of touch screen Macs! /s