Who said I'll be using speed 1/20 ?
I never gambling using that speed on tele, for sure :bsmilie:
(unless for panning, but that's a different case)
Exactly.
At 200mm without IS you cant have speeds like 1/20 and have decent keepers. With IS, you can afford to have lower ISO. Obviously IS is not everything, but it can be a lifesaver when you need it.