If you train in a dojo where most of your training is with very compliant ukie's, you may become too confident until that confidence is shattered by a guy in the street that doesn't know he has to comply with you and your technique.
"...very compliant ukie's... & become too confident..." does not just apply to aikido. I know plenty karateka & taichichuan-folks like that: it's the nature of the business.
how long does it take for it to sink in that the aikido dojo one's in is too compliant & predictable?
p.s. i'm still working on 200 wrist pushups for warm up (and 30 minutes of hard atemi), Henrysensei...not even close yet.