Take a look at the Sony catalogue and the huge holes in the range. No tilt shifts. No 200mm micro. No long telephotos.
And if you look at the actual dealers, you see a plethora of new old stock Minolta lenses as well, plus Sigma, and others. Your definition of "new" isn't passing any reasonable test here. Shoot, look at this:
Ebay Item number: 280274761896
This is a brand new, never opened new old stock Minolta Film camera. This was made in 1998. If I can find ten year old new gear in minutes...
T/S - see below for comments. Telephotos, too. 200mm micro, well, there are f/4.5 200mm macros out there. F/4.0 vs 4.5 is really splitting hairs.
The fact that some are available second hand is irrelevant. I don't want to buy my main lenses second hand and nor do many other people.
This is what I have a problem with. 95% of real pros *will* absolutely buy used lenses if there is a specific need. In fact, most prefer it because honestly, who wants to pay a zillion dollars for a new highly focused(read - single limited use) lens, when there is a like new one right over there in the dealer's case? Have you priced what the super long telephotos go for? Even Canon and Nikon have gaps in this area where you need to consider used older lenses, depending upon your need(say, you need a lens that can be stopped down to F/32 as one recent thread on this forum was asking about).
And as for tilt/shift lenses, virtually all users don't actually own one. Very specific use tool that usually is bought from another maker that will give you your choice of mounting system. 99% of the time, it's also manual focus. Honestly, if I was looking at a T/S lens, the OEM makers are the last place I'd look for one, considering the stupid pricing.http://www.fredmiranda.com/forum/topic2/367685/
$500 and works just fine. Your choice of mount. And this is just one of many makers of such lenses. Only the truly daft would limit themselves to only OEM lenses.
If you add in third party lenses, you are left with three DSLR lines - Nikon, Sony, and Canon. They are full range. Olympus and Leica and many of the others(plus nearly every MF camera)... they are really not full-range. I find it a bit annoying that you seem to be putting Sony in the same category, despite there being several hundred lenses for all three of the makers that will work.
If I was looking at a camera and the caption said "compatible with 200+ lenses" I'd consider that to be a "complete system", no matter who was making it.