Yeah... bad, bad, bad for 4E. The core game system appears built around minimizing ability score penalties. Default array in 3.5 included an 8; 4E's has 10 as the lowest score. Even "dumping" something to 8 via point buy has a minimal impact, what with the either/or pairing for Defense Values.
In my limited experience designing 4e characters, there appears to be a tangible rewards trade-off with point-buy. Do I max out my primary stat and accept low-to-middling secondary and tertiary stats? How does doing so affect my feat selection at later stages, or auxiliary additions to my damage output? Do I choose to be a little more moderate with my primary stat, and so have better secondary and tertiary stats?
In my new game, we have a brutish rogue with a very high DEX and STR and quite decent CHA. His damage output is even higher than it normally is for a rogue ... on the order of +9 damage when all three stats can be used in a situation (along with [W] damage and +2d6 sneak attack damage). Compared to the more standard +6-7 or less extra damage most brutish rogues would have, I wonder what effect this might have on my encounter balance, especially when multiplied across a few other players.
Any thoughts on the perils of allowing rather high attributes in 4e?