I heard back from Steinberg support.
In regard to the giant PDFs, I interpreted the response to say this is not going to change soon, it works as designed, though they did say they would keep it on their radar. I think it has to do with changes to OS X, and priorities at Steinberg. One view could be that a 10 MB pdf file (5-8 pages) is trivial to upload and download, since people are sharing lots of similarly large files.
In Windows PDF printing drivers are all 3rd party, and there are several options, on Mac there are no real options that I could find aside from the system driver. (Don’t know why)
I’ll just upload the large pdfs to my web space, or dropbox etc and send links. Not as nice as before, for sure.
In regard to Cubase becoming unresponsive in the PDF save dialog when saving duplicate filename, I’m waiting to hear back definitively. That one is a clear bug, so as slow as it’s going I suppose it will eventually get addressed.
I can’t really complain, there’s a lot thats good in C7.