I totally agree--it bugs me, too, when folks feel like you have to optimize. However, the devs could easily encourage players to create off-kilter, interesting, non-optimized characters by adjusting the math so a non-optimized character could still consistently hit 55% of the time, (or more), at high levels. Anything less starts to get into "unfun" territory, especially since the player could be missing with dailies and encounters, (and in 4e, power management is so important).
Also, about Weapon Focus--I personally wouldn't consider any feat that boosts damage as a tax. The attack roll is everything, since powers do so much more than just deal damage, and hitting with a specific power at the right time could be the difference between success and failure.