Buying the Blu-ray version instead of the 4K UHD Blu-ray version?

[Goldash]

Apologies if this question was ever posted before. In what cases would you buy the standard Blu-ray over the same title on 4K UHD Blu-ray? Should you ever?

The only reason I ask this is because of the strange reliance by studios to source 4K Blu-rays from outdated masters, 2K scans or 2K digital intermediates.

Of course, going with a newly remastered/rescanned/native 4K image is always preferential to a 1080P source. But when many players and TV's handle upscaling really well, where do you draw the line with releases that contain 2K (or possibly lower) content?

HDR, Dolby Vision and Dolby Atmos make this decision a lot easier for many. But without the Blu-ray.com thread that lists Native 4K masters (https://forum.blu-ray.com/showthread.php?t=270798) I'm sure I would have more than a few cases of buyer's remorse, regardless of the obvious advantages of HDR.

For example, I recently bought Get Out on standard blu-ray during a sale, but only after finding out it doesn't use a native 4K scan on its UHD release.

I can't be the only one who finds the promotion of some 4K content somewhat misleading. That's why I made this thread. I care a lot about picture and audio quality but I find the use of "uprezzed" transfers really confusing on a format designed for optimal quality (even in spite of HDR).