Also, in my opinion, which I suggested years ago, everything should scale with the character level rather than the individual class levels. This is the whole point of multiclassing!
It doesn't make sense that if you have 3 levels in wizard and 17 levels in fighter, you can only cast a web spell as if you were a level 3 wizard. A multiclass character should not be a kind of "schizophrenic" character with a level 3 wizard and a level 17 fighter. They are a single character with levels in both wizard and fighter, but overall, they are still a level 20 character, not a level 17 fighter and level 3 wizard.
I don't understand why this is so difficult to comprehend, but it simply doesn't make much sense! If things are meant to scale, they should scale with the character level.
I can only assume that the initial idea of multiclassing was that there should be no scaling with individual class levels, or at least the impact of that scaling should be minimal, providing only a small advantage.
If you multiclass and end up with a multitude of abilities, but none of them work properly, there is no point in multiclassing.
Some players argue that everything is fine because they multiclass and it is still effective. However, let's be honest here, it only works because they utilize abilities from different classes in their multiclass build that actually function well.
If, for example, you multiclass as a 2nd level rogue and evasion only worked against traps in level 4 quests and you could only disable traps in level 4 quests, and evasion only worked against level 4 monsters, you would not multiclass two rog level for evasion and doing traps. And then you would see how nonsensical that is!
An actual perfect example of how nonsensical it currently is can be seen in the Bane of Undead enhancement in the Exalte Angle Epic Destiny. If you choose that enhancement, you gain the Turn Undead feat, which scales with your paladin level. However, this feat is only useful if you are not a paladin, as a paladin's level is already inherently high enough to have the same effect. As a result, you end up with a feat that doesn't serve its intended purpose of turning undead (destroying them or making them cower).
In essence, with a level 32 character, you are turning undead as if you were a level 0 paladin. That is so sad that it's almost funny.
In contrast, the Hands of the Sentinel enhancement in the Unyielding Sentinel epic destiny scales with the character level, making it actually useful. I doubt anyone can seriously claim that it is overpowered for that reason. Even if it had the additional feature, which I consider unnecessarily powerful, of scaling with your constitution score, but only if it is higher than your charisma.
Those who predict doom in this scenario are simply wrong.
If the general rule were for abilities to scale with character level, it would not be an issue! However, I think if I had the power to decide, I would remove all scaling in DDO and balance it without any class or character level scaling.