Because the interrupt rate was very high per hit against high level spells. There was not a flat rate on interrupting a spell with melee. The formula took into account the skill level of the spell being cast and the channeling level of the player and another factor was the location at the start and finish of the spell. That's why melee classes with little to no channeling spell easily got interrupted when casting Crystallized Pumice. Usually just one hit would interrupt a Warrior using a Crystallized Pumice, another huge advantage hybrids had.
The higher the skill level of the spell being cast, the better the chance of interrupt was. That's why casters who would cast Gate could sometimes channel through 15 hits and still get the spell off on occasion, but get hit just 5-7 times and interrupt nearly 100% of their highest level spells. Nobody worth their shit in PVP ever tried to channel spells through fast melee because the vast majority of the time it led to an interrupt and heavy damage taken by the caster. Just a few hits against a high level nuke and it was all that was needed to interrupt it so in some cases the interrupt rate per hit was EASILY over 15% per hit.
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