The long-tail problem pointed out by +Paul Vixie
is a widely known statistical effect hitting all industries, but worse with software. As +Jim Gettys
and +Dave Taht
and others have documented, it's a growing concern in embedded systems.
In this case, I see some SSH clients which are too old for which the option doesn't exist. So disabling in all configs isn't an option.
We need a balance between stability and serviceability.