Shin Okada
Explorer
It's my understanding that most of the written material wasn't MEANT for min-maxing... Doesn't stop those of us from actually doing it.
Right. But Cohort rule is more so than most of the other rules are. Many of the rules are optional indeed. But Cohort is more "optional" and specifically need's a DM's permission.
IMHO, a play group should think twice before even allowing one cohort. That will technically let a player control another PC and thus that player takes more actual playing time comparing to the other players. That is often more problematic than a player having a particularly powerful PC.
Also note that a cohort takes his own share of treasure. Having 2 cohorts means that a player takes two-men worth of treasure share. Some other member may not be happy about it.
In overall, regarding cohort, what important is not if that is legal by RAW or not. The important thing is if the DM and other players are happy about it or not.