Why would you spend whole week, if you can copy the configs from older machines?
Because some tweaks can't just be saved and restored later.
which is one of Gnome's problems. I don't want to install extensions only to realize they won't work on the new Gnome version.
Which then translates to bugs here and there, inconsistency and may other problems.
And while Gnome is a pain in the *s sometimes because they remove features, it's still better than the alternatives to me.