What if it rains? That was your excuse last time 
If i wake up and its chucking it down, i won't bother, make it another day.
So if you take your brand spankers new (after you pass your CBT) motorsickle out for a sunny sunday jaunt then - horror of horrors - it starts to rain, what then? Park up and get a train/taxi home?
If you want to walk the walk, then the least you could do is learn a bit of elementary self preservation and experience 'what if?' when you are still a Bambi Biker - rather than as an apparently fully feathered, hard as a hard thing, seen it/done it eejit that got it wrong when he should have known better, type person..........
The tarmac can be sore and jaggy when you hit it wrong, irrespective if wet or dry..... I've tried both as well as points in between, just for fun. Rather not do it for laughs sometime soon again, thanks....
The way i look at it, I'd rather be able to ride a bike first in the dry, be confident on it, not stalling, turn well, not mess up the gears. I had enough problems working out what gear the damn thing was in when the road was clear!
When i have that ability, when its raining i will go out... way i see it is i don't want to be stalling it, not knowing what gear i am in, sitting at a junction in the pouring rain.
I want to be able to change gears up and down without thinking what to do in terms of clutch, which may left foot has to go and so on, i want to be thinking about how to adapt to the conditions, ie, i should be in gear 2 for this bit, do xxx mph.....
Basically walk before i run!