With Canon lenses: there are 2 IS modes, 1 allows for panning the other doesn't.
Some of the lenses I have owned have 2 modes, some don't. I know the 70-300 F4-F5.6and the 70-200 F2.8 IS do have both. The 24-105 has only one (from memory).
I would concur that it is more about technique than equipment: you could use a monopod and pan on a central pivot point - this would eliminate the need for IS.
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