Whereas I'd argue that the game would have swiftly become unplayable for a large number of people.
Hear me out.
I'm not arguing that 4E's method was the best way to go. Maybe it was, maybe not. But I
will argue that "balancing" wizards by making their spells really powerful, but easy to disrupt, would've been one of the worst things for the game.
Here's the thing. I know that lots of people have a problem with WotC's use of the term "fun" lately. I don't pretend to know what
everyone thinks is fun, but I
do know what most people I've ever met, talked to, or even heard of think is fun.
And I don't know
anyone who enjoys sitting around twiddling their thumbs because they're unable to contribute round after round in combat.
It may not be safe to assume that
nobody would enjoy that, but it's
absolutely safe to assume that the
average gamer doesn't look forward to sitting around doing nothing. That's not what gaming's about.
With a wizard who has Phenomenal Cosmic Power, but at the cost of being easily disrupted, every combat is almost guaranteed to go one of two ways:
1) The wizard obliterates everything, and the other players are cast in the role of sidekick at best.
2) The wizard fails to do anything.
Either way, someone's having a really bad experience.
Are there some groups who would enjoy playing that way? Absolutely. Would it have worked for
most groups? I'm willing to bet
no. And would it have turned off more new players than it ever brought in? I'm willing to
guarantee the answer is
no.
Is it possible for balance to grow so strict that flavor suffers? Absolutely. But that doesn't change the fact that a game with any hopes of retaining popularity has to have
some focus on balance. And making
every fight a swingy one, based on the success or failure of a single class, is absolutely detrimental to any sort of balanced system.