You cannot compare solar grenades to void grenades. You cannot compare two grenades from armour to two grenades that require you to use one subclass (which happens to be the support class and least useful for solo play and DPS). The classes are balanced apart from armour. Therefore, I take solar grenades into account. You missed the point, that's why it seems invalid.

Why can't I compare a piece of gear that gives me two grenades compared to a subclass that gives me 2 grenades? Do I not get 2 grenades? And why don't you use a different grande for the warlock other than the solar if you want to do a lot of damage?

My point is that the gear is imbalanced between classes. That is an indisputable fact, because the stats for all gear is freely available to compare. If naked classes are imbalanced, that is a separate issue. It's also a very complex issue/ Do you think a titan is weaker than a warlock unless he has that one particular armour perk? You should not need special gear to compete with perks that one class has by default. That would be nuts.