I have already repurposed my first DST to my first stage bottle
And the original poster stated in the first message "I want to buy right the first time" and "diving local quarries, maybe some Erie wrecks." I doubt anyone will continue that for several years without going tech (or quitting).
Apparently, you are exceptional... ;-)
To me, "buy right the first time" means get something with a swivel turret, and that is DIN. Sure, you can convert most any yoke reg to DIN, but it's still spending money because it wasn't "right" the first time.
But, a swivel turret is no benefit for single tank diving (in my opinion). And, for most people, neither is DIN.
Anyway... I have regs for diving doubles, sidemount, and deco cylinders. I still want to also have a reg set that is for diving single tank. Thus, at least for me, whatever I bought for single tank rec diving would stay dedicated to that, even when I went tech (which is just how it went for me).
To ME, going tech and giving up single tank, recreational diving is kind of like a period I went through in my life where I was racing motorcycles and gave up having a street bike for a while. There are some people that are fine with that. I learned that I am not one of them. Tech diving is awesome. But, doing that to the 100% exclusion of fun, single tank, recreational diving is, well, it's not for me.