There's just something off about taking a 60% chance vs a 2HKO, especially on something that's meant to be used for its resistances/immunities. In the same way you say Eggy has better things to do, wouldn't Gengar have better opportunities to come in and do what it needs to? 60% accuracy is just not high enough for me to feel safe about taking 60+% damage. Maybe it's just me.
Also, I don't see where Alakazam is overhyped. You'll have to help me out on that one.