I can't argue about your preferences here, but these seem to be subjective preferences or complaints about warts.
In terms of feature and ecosystem surface, there is one area where I think Django is a clear winner: Django Admin. It is a very mature part of the framework and there is a large ecosystem around it. Compared to how useful that is for standing up an MVP SaaS (especially in anything remotely enterprisey), I would find it difficult to consider Rails if I ever envisioned needing admin.
For what it's worth though, I think that Django and Rails are both exceptional choices and in terms of ergonomics, best in class. I wouldn't have complaints about the framework to coming into a project using either one.
In terms of feature and ecosystem surface, there is one area where I think Django is a clear winner: Django Admin. It is a very mature part of the framework and there is a large ecosystem around it. Compared to how useful that is for standing up an MVP SaaS (especially in anything remotely enterprisey), I would find it difficult to consider Rails if I ever envisioned needing admin.
For what it's worth though, I think that Django and Rails are both exceptional choices and in terms of ergonomics, best in class. I wouldn't have complaints about the framework to coming into a project using either one.