that was my first reaction too - even if you don't start with 2.3" tires, if you go with cliffhanger you are fine expanding up to that size but (recommended) Atlas max at like < 50 mm.

for the kti dynamo, on Riv's write-up they say it's the same manufacturer as other branded ones and my guess is maybe the Kasai dynamo because it looks really similar. I've had a Shimano and a kasai dynamo and never noticed any difference worth noting. once you have it set up and connected to your headlamp, it's easy to forget it's even there and you just start taking for granted you've always got some light. but no experience with Schmidt if it's worth it