So you're telling me..

[Akiudo]

If a selfish dps does the same or less rDPS as every class with raidbuffs then you never get any more damage from taking these damage focussed jobs. The reason being raid buffs are multiplicative, so adding another job with a generally higher rDPS and a raidbuff will result in a higher total raid damage than including one of those lower rDPS selfish classes, made more potent a difference as you align burst windows with each other/the fight more efficiently and accurately.

see but thats exactly the point, the classes with raid (dps) buffs NEED to actually deal more RAID dps in the perfect scenario or they will in fact allways be worse. the fact that they gain more by having an optimized group means they also lose more by having a group that isn't perfectly optimized.
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lets say classes had no "support", i.e. heals, shields, rezzes and whatnot, only dps buffs. exactly because raid buffs can and do stack to the high heavens you can now

1) make it so in a "perfect" scenario the buffers actually offer more raid dps meaning they will be stronger at the top and than get overtaken relatively early on when you go lower

or

2)you make it so that even in that case the "pure classes" do more meaning they will simply allways be stronger.

acting like samurais being overtaken at 95% while still being stronger everytime before is an issue but samurai simply allways being the stronger choice is actually good design is turning raidbuffs into an detriment.