Right, there are plenty of powersets and combos where the required investment in primary/secondary is low enough that a fifth, maybe sixth pool would just be a total no brainer and blanket buff. If there weren’t, Bill with his min/max style wouldn’t be interested in suggesting this.
The one I’m currently agonizing over couldn’t fit it all, but only because I’m insisting on an unusually high number of primary/secondary choices on that one (a non-power gamer move as that many click powers isn’t optimal).