Aenghus
Explorer
While arguments have focused on magic being broken in combat, it's also broken out of combat, which is relevant given how many people have asked for more non-combat emphasis in the new edition.
I've played and run a number of games that went to high levels, and it was noticeable that the spellcasters had much more agency and breadth of action in all parts of the game, in and out of combat. This was particularly noticeable for mid-to-high level wizards, who could teleport anywhere, spy on anyone, charm most NPCs, pry out secrets, polymorph etc etc.
While other classes can some do of these things, wizards in 3e or earlier are the only class that can do everything (with some preparation). And that's too much flexibility.
DMs have to put special obstacles into the game to restrict such tactics. Some Dm's don't allowing PC wizards to dominate the setting. While it's true wizards are vulnerable when their defenses are down, they aren't when prepared, and they are sufficiently vulnerable that dropping their defenses makes them too easy to kill.
Non-spellcasters have specialities and should be able to compete with spellcasters in their specialities, or even be better.
I've played and run a number of games that went to high levels, and it was noticeable that the spellcasters had much more agency and breadth of action in all parts of the game, in and out of combat. This was particularly noticeable for mid-to-high level wizards, who could teleport anywhere, spy on anyone, charm most NPCs, pry out secrets, polymorph etc etc.
While other classes can some do of these things, wizards in 3e or earlier are the only class that can do everything (with some preparation). And that's too much flexibility.
DMs have to put special obstacles into the game to restrict such tactics. Some Dm's don't allowing PC wizards to dominate the setting. While it's true wizards are vulnerable when their defenses are down, they aren't when prepared, and they are sufficiently vulnerable that dropping their defenses makes them too easy to kill.
Non-spellcasters have specialities and should be able to compete with spellcasters in their specialities, or even be better.