Some Dt track that are round, dont like no wheel spin bikes, so you end up ridding around like a pee wee 50 all upright and uptight, kinda spoils any fun.
YOu need at least enough power so you scare yourself when you run in fast and need to tip it over inot a turn and it starts to drift.
Whatever that bike is for you - ride it, you grow into it, anything less and your interest will turn into riding around your back garden.