Not fulfilling the trope of the fighter being the near unlikable and unkillable ball of death or many of the other D&D tropes of other classes is the source of imbalance.I'm saying that the tropes of modern D&D demand that the Wizard be THE top-tier class at the highest levels (with other casters nearly as good, although less versatile), the single best class at solving non-combat obstacles, but have more fragility and a weaker starting point to compensate.
However, there is no such demand that a Fighter can't be a near unkillable wrecking ball that even a Wizard would only face with extensive preparation. Maintaining D&D tropes demands that a gap remains, but it doesn't mean it can't be shrunken even further and only really relevant at the highest levels.
At some part WOTC was unwilling to take a stance. In others they took a trope which is outdated to their current demographics.
Edit: and unkillable
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