All of the default software that comes with the Ubuntu desktop will run reasonably well with 2Gb. Its the websites and electon apps (i.e., websites) that will make it swap. That and modern users that want to keep dozens of programs or websites open -which users 10 or 20 years ago may have known not to do.

Worse is relative, a proportion of the requirement increase will be due to worse code, but much more will be for features to make the software more accessible to more people, and adding features without needing to remove old ones, neither of which are a bad thing, otherwise everything would be a command line tool that removes options every few months and only has one way to use it