@Galendil, that’s fine, I’m happy to explain.
In real life, I’m a professional photographer. At the moment I still have around 16,000 images on my Mac that were imported into Aperture (https://en.wikipedia.org/wiki/Aperture_(software)). It was a great little program until Apple decided to simply pull it, without much of a heads up and without providing any way to export the images (retaining their EXIF data which to professionals like me is vital) into Adobe Lightroom, or Photomechanic or any of the image management bits of software that most professional photographers use.
This is pretty much my life’s work (triple back-ups are in place!) so I cannot screw it up. I love the tech and I’m an Apple loyalist (having used them for well over 30 years now) but my opinion, at least in this regard, towards Apple, needless to say, is fairly frosty.
In terms of other software that’s affected, I also do graphic design for a charity who have a PC server. At this point there is no update for the server interface so that Big Sur can work with it so if I was to update, I couldn’t actually do any work for them.
Don’t get me wrong an ideal solution to this would be to get a dedicated Mac just for Eve, but I don’t have that kind of cash I’m afraid, at least right now after months of earning very little because of Coronavirus.