I was really shocked when I found that Preview in Ventura would no longer open PS and EPS files a small but annoying reduction in quality of life for me
when preview stopped opening video files that had a codec other than ProRes or H.264, it just felt broken to me as well. for the longest time, one of the first things i'd add to any new OS install were the QT extensions of the other codecs. now, that's no longer supported.
I've heard QuickTime extensions will come back in Sonoma
Do this no longer work? https://github.com/sindresorhus/quick-look-plugins