For me the difference was mindset, with "unserious" approach, I also expected less. Both in terms of effort and result. So suddenly "meh" improvisation (or whatever) is OK, because the goal was not good improvisation. It was too do pretty much anything and maybe learn little bit.

And that change of expectations made difference in long term - in two years span I improved much more on things I had low expectations at and kept fun and thus kept doing bit by bit.