I don't really care about all that. I just think it's weird to call it a challenge when it's not. It vastly simplifies the class design and just makes things die slower (You'll be doing somewhere around 40% less damage to mobs just because you're missing your second AoE at level 40 onward so it's hardly insubstantial). Now if you tried to get to floor 200 of POTD as a GLD now that's a freakin' challenge right there.
As you've said there's no discernible difference between a gimped tank and a shit tank. It's nothing special.