I don't know, I've been using Windows on desktop since 3.1 and found Windows 8 perfectly usable. In fact it was immediately better than Windows 7 because there were more keyboard shortcuts for window management.
The biggest regression in 8 was the Control Panel disaster that continues to this day and is less related to mobile friendliness and more a mismanaged attempt to try break free of some very ugly legacy components that were already behaving inconsistently in 7. Setting up a custom DNS still requires diving deep into multiple layers of ipv4 settings and popups, exactly as it did in Windows NT, I believe. It's a nightmare.
The Start menu at least since 8.1 was toggleable from full screen to corner mode, so I don't think that's really a worthy area of complaint. In every other respect, 8 behaved more or less like 7. Keyboard shortcuts worked the same. Double click worked the same. Explorer was still Explorer.
Edit to add: I just checked and Start menu was still full screen only in Windows 8.1. I guess it never bothered me because Ctrl+Esc still popped it, you could still type the name of the shortcut to find it, Win+X was there for admin menu and you could still hit Win+R to run binaries directly. Having a two-dimensional arrow key navigation felt faster than tree-based to get where I wanted too. Maybe for keyboard-centric users it didn't feel much different, while for touchscreen it was clearly better.
It's Windows 10 where they actually started actively removing features, and Windows 11 has taken that to the extreme by replacing the entire start menu and task bar philosophy that's been a core part of Windows since 95 and replacing it with some hideous MacOS dock like thing. Don't even get me started on the messing up of right click in Explorer. It's like Microsoft got taken over by Apple developers who never used a Windows PC in their lives. Awful.
The biggest regression in 8 was the Control Panel disaster that continues to this day and is less related to mobile friendliness and more a mismanaged attempt to try break free of some very ugly legacy components that were already behaving inconsistently in 7. Setting up a custom DNS still requires diving deep into multiple layers of ipv4 settings and popups, exactly as it did in Windows NT, I believe. It's a nightmare.
The Start menu at least since 8.1 was toggleable from full screen to corner mode, so I don't think that's really a worthy area of complaint. In every other respect, 8 behaved more or less like 7. Keyboard shortcuts worked the same. Double click worked the same. Explorer was still Explorer.
Edit to add: I just checked and Start menu was still full screen only in Windows 8.1. I guess it never bothered me because Ctrl+Esc still popped it, you could still type the name of the shortcut to find it, Win+X was there for admin menu and you could still hit Win+R to run binaries directly. Having a two-dimensional arrow key navigation felt faster than tree-based to get where I wanted too. Maybe for keyboard-centric users it didn't feel much different, while for touchscreen it was clearly better.
It's Windows 10 where they actually started actively removing features, and Windows 11 has taken that to the extreme by replacing the entire start menu and task bar philosophy that's been a core part of Windows since 95 and replacing it with some hideous MacOS dock like thing. Don't even get me started on the messing up of right click in Explorer. It's like Microsoft got taken over by Apple developers who never used a Windows PC in their lives. Awful.