I agree. I think both should be completely redesigned from the ground up, but they're not interested in doing that in 6E.

• Wizards should be boosted in early levels and nerfed in later ones, and should be split into multiple classes focused around illusion, commanding undead, AoE damage, control, buff/debuff, etc. (but not all of them simultaneously).
• Fighters should get maneuvers and cleave damage focusing on one or few targets.
• Rogues can continue occupying their niche of single target, high risk / high reward critical damage (but note key phase: high risk). Etc.

Everyone should have a clear specialization with a little overlap. A class should be the best at a thing and adequate at something else.