Just curious,have you ridden a T Line? Cuz I own one. It's not a heavy bike,nor is it a slow bike. A full derailleur drivetrain would mean a larger folded size,and there would be serious limitations. My gear range is 28-114". What derailleur setup is going to give me that? And fit into 112mm spacing? And not have a cage that hits the ground or has issues with dropping the chain?

I can't think of a single 20"+ folder that I'd own,because none of them fold as small as a Brompton,and that's one of my top priorities for a folding bike. I've had a Mu SL and a Speed Pro TT and didn't keep either because they were way too big when folded(and didn't fold as easy). I also had a Mezzo D10 at the same time I had my S6,the Brompton stayed,the Mezzo got Craigslisted. The Mezzo was a touch lighter with a normal 1x10 105 group,but had limited gear range,dropped its chain,and had a crap fold.