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But the "golem" principle can only be directly applied to offensive spells (explosion, chain lightning...), but how can it be applied, say, to slow? Slow down, but not as much? :)
Personally, I'll say: of course, it's frustrating (and can lead to big losses!) when "dwarven" resistance triggers when casting, say, berserk or blindness on a powerful and fast enemy stack (dragons, etc.). :( Therefore, one of the most valuable artifacts that I always try to take when possible is the Sphere of Vulnerability.
the golem principle only works for golems, although if we follow the developers' logic, they should have given the same resistance to gargoyles, as they are created in a similar way.
and regarding the +1 sphere, it is often given in Utopia, and the balance of power against castles with immunity to many mind control spells shifts in the other direction.