Yeah I'm surprised to hear that too. Other people (some with very expensive setups) seem to be able to image with other software that uses JPG for focus, plate solving etc, and their images don't seem to suffer.
I do take your point about not wanting to feed people with false data, but is it possible there's a slight bit of OCD going on here, and if so, would it not be ok to relax some of these restrictions, seeing as we are only talking about DSLR users here anyway, and by their very nature DSLR's are never going to be exactly pushing the boundaries of what one can achieve in AP. Also, let us not forget that there are no doubt many more DSLR users out there than CCD users.
To get back on topic though 
Xplode 7 secs is seriously fast mate, I can only wish for such speed. Do you have a fast setup by chance? (SSD, and/or USB3). Your 6D is about 20MP while my D5300 is 24MP, but even so that doesn't even come close to explaining the time difference. I am using an old Netbook which has 3 USB2 slots and a 5400rpm HDD. Yes it's slow, but when I use other Astro software it can take Raw exposures almost back to back while it saves to both the SD card and the computer, so I still can't understand how it can manage it and SGPro has such long download times by comparison. I've tried a few different cables and all the USB slots, there's no difference either way.
The only thing I can surmise is that there must still be a lot more headroom for SGPro when it comes to data transfer rates?