Yes, that is a good question. Keysight, for instance have Gaussian response to 500MHz and brickwall response for 1GHz version of same scope.
These Tek scopes have been in the wild for many years, with many being frankensteined and repaired and who knows what..
BW can only be reliably verified with frequency sweep. Step response risetime is not reliable, it is only estimation when we do know AA filter shape.
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