This is a poor reason to ditch Ubuntu as almost no-one uses the source ISOs. The sources are still available online - just not as however many ISOs that are needed (9?).
I've been using Ubuntu at home and work for many years as it's at a convenient point between bleeding edge (like Arch) and slow and stable (Debian), plus due to the large user base there's a lot of information on fixing issues and configuration instructions.
However, I'm not a fan of snaps as they seem to cause more issues than they solve. (One of the reasons that they're binning the source ISOs is because they don't currently include source for the snap packages, so rather than spend time fixing that for a download that very few people use, they're just stopping producing them). Since they moved to using snap for Firefox, I've had a few instances where Firefox wouldn't start. There's also issues with how Firefox interracts with the OS and so some extensions don't work properly. But probably the most annoying is that you have to close a snap package for it to be updated! So, I generally have Signal and Firefox running all the time, and now I keep getting messages about having to close them so that the snap package can be updated - it reminds me of running Windows.
TLDR; ditch Ubuntu because of SNAPs, not because they're stopping the source ISOs that you never used anyway.
I'm currently sticking with using the Snap packages so that I can evaluate how well they work and the level of issues, but if they annoy me enough then I might well move back to standard packages.
I've been using Ubuntu at home and work for many years as it's at a convenient point between bleeding edge (like Arch) and slow and stable (Debian), plus due to the large user base there's a lot of information on fixing issues and configuration instructions.
However, I'm not a fan of snaps as they seem to cause more issues than they solve. (One of the reasons that they're binning the source ISOs is because they don't currently include source for the snap packages, so rather than spend time fixing that for a download that very few people use, they're just stopping producing them). Since they moved to using snap for Firefox, I've had a few instances where Firefox wouldn't start. There's also issues with how Firefox interracts with the OS and so some extensions don't work properly. But probably the most annoying is that you have to close a snap package for it to be updated! So, I generally have Signal and Firefox running all the time, and now I keep getting messages about having to close them so that the snap package can be updated - it reminds me of running Windows.
TLDR; ditch Ubuntu because of SNAPs, not because they're stopping the source ISOs that you never used anyway.