When reading about straylight affecting optical systems, I read that refracting systems are much better than reflecting systems, because in the latter straylight bounced back and forth between the mirrors creating kind of a straylight fog leading to a brighter picture once all those rays reach the focus - this is the picture in my mind of the process.
Here is a good paper about the straylight reduction effects from baffling improvements:
In one of the Dragonfly Telephoto Array articles I read the statement concerning lens and mirror systems.
Ok, you build a Cassegrain-like telescope with two mirrors and a whole in the primary mirror; like in the link.
And you can only polish or have only one of both mirrors extraordinarily smoothly polished.
Which mirror would you want to have a smoother surface causing less scattered light, the large primary or the smaller secondary mirror?