One problem I have with major version upgrades of Linux distributions is the number of changes to different programs/systems. Every 18 months I have to learn how to do a number of things differently. Program x disappears, you are told you have to use y now. Linux has been around for decades at this point. Something that old should be considered mature and not need major changes.

Do we really need a new major version of gtk/qt or a different firewall program, when all those things have existed for many years?