The drops just aren't quite deep enough to be true horizontal drops, first off. Second, even with bolt on hubs and a Tugnut (which needed a bit of modifying to fit the drops), the hub shifts side to side enough to cause the chain to chatter. Third, I like the 32-16, and while I can probably find the sweet spot from a tension perspective, and not need a tensioner even if I could keep the hub from wandering and get past the shallow drop issue (you can't get the wheel off without pulling the crank or breaking the chain) and finally...
I'm a lazy bastard!
I'm sure there's a solution to this collection of minor glitches, but at the end of the day, they are minor glitches. The bike runs so smooth with the tensioner that I just don't feel the pressure to change it.
Chiefly though...the shallow drop is the issue..a rear facing shallow drop prevents the loosened hub from being slid forward enough to derail the chain, or the rear wheel from clearing the rear of the dropout to be removed from the bike. One flat and subsequent drivetrain dismemberment and you'll want a tensioner and a longer chain.
Drowning in Retro!