I think Egypt's design is fine, honestly. I mean yeah, they're simple, but what's wrong with that? I think there should be a few straightforward Civs in the game for new players to learn with. And simple doesn't necessarily mean weak, just look at Rome as an example. If there's anything I'd change about Egypt, it'd be their leader ability. I'd love an alternate leader that either leaned more into the building aspect or had a neat warring bonus. Or both!