While I understand your hesitation, I definitely believe there could have been at least five more relevant episodes in Season 2. This season was overall character driven instead of a "planet of the week" format we've seen before. So, there could have been some extra episodes that extrapolated on the seasonal Gorn arc, or an Ortegas episode, or a Pelia episode. There's a lot of potential to provide spanning character and seasonal arcs while delivering episodes from different planets over a 15 episode season.
I definitely believe 20 episodes is pushing it, but a 12-15 episode season could work if the stories are laid out well.