Specifically, but in laymans terms, what is the down side of using forks that are too long?
The head angle is reduced (in cycling terms, increased if you're a motorcyclist) and the trail is increased. Both of these slow the steering. In extremis, too much trail causes to head tube to drop too much as the wheel turns, so your bike handles like a Swedish chopper
The head angle is reduced (in cycling terms, increased if you're a motorcyclist) and the trail is increased. Both of these slow the steering. In extremis, too much trail causes to head tube to drop too much as the wheel turns, so your bike handles like a Swedish chopper