macOS is the most consistent OS and Windows the least [1]. With the exception of IrfanView I find neither of those apps particularly crusty though. There's https://imageglass.org
I personally moved from macOS to KDE Plasma and I'm a happy camper as long as I stay with Plasma/Qt apps.
[1] https://ntdev.blog/2021/02/06/state-of-the-windows-how-many-...