You didn't shorten flower times, you added a photo-period flowering schedule to your auto making it a photo finisher.
alot of the "fast versions" are infact just that.. water down lowryder to get non auto or semi auto and make a version that flowers 1 or 2 weeks faster. this is def the case and can be observed in older var ie ruderalis skunk from sensi and mighty mite(semi auto) along with new var. fast amnesia fast og kush fast critical etc. usually the auto version back crossed again to the original mother lowering amount of auto and decreasing flowering time.
cheers!
The answer is "yes and no." Most top shelf herb takes a while to produce good cannabinoids and develop a quality, complex terp profile. There are exceptions, though. A good example is Bubba Kush, which has phenos that finish in under 2 months. And it's some killer smoke by anyone's standards.
So, long running strains are usually higher in quality pound-for-pound vs quick ones. But anyone who says every single strain that's a fast finisher is no good hasn't sampled many varieties.
I've seen a lot of strains that could be harvested at 6 or 7 weeks but were much better after 8 or 9. I've never understood spending months to grow a plant just to cut it down a week or two early.
I think it helps to have a side area where you can put plants for their final 2 or 3 weeks, without taking up space in your main production area.