Jazz, I am hugely flattered you remembered - I can’t remember what I went upstairs for half the time, let alone what I said a while back
Having clipped loads of queens, I have absolutely no evidence of a deleterious effect on them. Indeed due to it appearing to delay any swarming attempts post cell sealing, I actually think I retain more original queens longer than I would if they swarmed successfully with an unclipped Queen.
I personally clip both wings by at least a half. Less than that or just one wing does sometimes seem to let the queen fly enough to lose the lot. There is no leakage of fluid as sometimes suggested and the Queen seems entirely unconcerned, quite often wandering back onto the frame to continue laying.
As you say, I see no good rationale for clipping before the start of the following season. Then if I did do something daft like drop her (would I ever be so cack handed??!) there are the right conditions to make them queenright again. Clip later on, maybe not so.