Not only that, but in photoshop and word dialogs for features released in 1995 had different design conventions from dialogs from feature released in 1999. Not UI controls and stuff like that (everything was still using win32), but the design language itself. Like how to display things to user or how to align buttons and stuff like that.
If anything this kind of layout patterns are better today than they were back then. What the OP is complaining about was ALWAYS a problem for any long-lived software. But given how much _older_ some software is today it is no wonder it is way more noticeable.
Win95 had a bunch of Win3.1 settings dialogs just like Win11 still has a bunch of Windows98 setting dialogs (the network adapter TCP/IP configuration one comes to mind).
I mean just look at this:
https://www.reddit.com/r/Windows10/comments/l85hsx/windows_3...