Agree. Most of them were not stronger (until you found potions or a gauntlets of Ogre Power that I believe the Cleric could not use), but they did have better weapons and that mattered a lot.
To start with the missile weapons as noted above, but aside from the fact that only the fighter could use bows, they also got 2 attacks a round when using bows .... right at level 1. Someone throwing darts (Magic-Users, Thieves or Druids) could get 3 attacks a round if enemies were close, but not too close. But 3 darts (1d3) are less damage than 2 arrows (1d6) and with much less range.
Even just talking using melee weapons, you might think a Mace doing 2-7 and a Longsword doing 1-8 are equivalent, but they are not.
The longsword had a longer reach so when two opponents closed the Longsword attacked first
The Longsword had a lower speed factor so after melee was joined the Longsword user went first
If the enemy was Large the Mace damage was reduced to 1-6 while the Longsword was increased to 1-12
Now what did the Mace have going for it? It did have a better hit bonus (+1) against enemies in plate mail armor .... but the fighter could switch to a Pick against those enemies, getting a +2 while doing the same damage as the Mace with a better reach and the same speed factor, or if they are mounted the Fighter could switch to a Lance that got a +3 and got even more reach with a better speed factor.
Fighters were truely the king of battle in 1E, even at high level.