I'm A Banana
Potassium-Rich
Whats the point of having classes if everyone just does everything as needed?
D&D classes have always been about defining archetypes. If every class is a utility infielder then how can you really distinguish the classes. Everyone defending, healing, sneaking, and dealing damage is really a classless system in function if not form.
Class != Role
Clerics still are divinely powered. Rogues still sneak and stab. Fighters still take point. Wizards still cast the spells that make the people fall down. There can still be significant differences in the quality of being able to fill the role, and differences in how it is done. Clerics can still be the bestest healers, they are just not the ONLY healers. Fighters can still be the highest AC in town, but they are not the ONLY characters who can take a blow. Rogues can deal the highest damage, but "striker-level" damage doesn't REQUIRE that someone have a certain class (or group of classes).
You are thus not forced into choosing a certain role in order to balance the party. Someone who really likes helping others can still gravitate toward the cleric, but if no one in the group is particularly inclined for that, no one is FORCED to be the healer, since everyone can accomplish some baseline healing.
This is a strategic element to the game. It adds flexibility in encounter design, party design, and round-by-round tactics.
Sometimes no one wants to be the support guy. For those circumstances, EVERYONE should have to share the burden of being a support guy.
Not to mention that this helps mitigate the eyesore of 4e's "An entire class for every power source and role!" when all that you might need to play an Ardent-style character is actually just a mechanic to turn your psion into a leader for a round.
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