Not accidental… it’s incidental.
Any suitably complex system will have potential imbalances. A dozen+ classes, subclasses, races, spells, magic items and feats. Not to mention the imbalance a Dungeon Master provides, different genres, low magic, monty haul, gritty fantasy, high fantasy, Ravnica, Strixhaven, Forgotten Realms, Ravenloft. Give me a break. It was never going to be perfectly balanced, there are too many moving parts.
That’s why we have DMs… because it’s not Cluedo or Game of Life. The DM curates the fun, because the rules alone can’t do it.
Perfect balance in quality RPG’s if a myth. Nonetheless, 5e gets as close as I have seen it.