There's a difference between saying, "I wish market conditions were different and allowed for more shows to have longer runs," and saying that it's unnecessary and arbitrary for most shows to be brought to an end after 65 episodes and it's wrong that they should be brought to an end at that point. Expressing the first view would be fair enough, but the second makes no more sense than when people say the DC Universe movies should be longer than 75 minutes regardless of budgetary restraints imposed by economic reality.How is it "nonsensical" to say I'm unhappy with the way things are? If everyone thought that way, nobody would ever try to change things for the better. Even if there's no way to change things, I'm still entitled to express my feelings on the matter. Everyone has the right to express an opinion.
Unfortunately most animated shows these days are loss-leaders and only go into profit for the studios who bankroll them once syndication and merchandising money rolls in, and there are significantly diminishing returns from syndication and merchandising once you produce more than 65 episodes (maybe you're already aware of that and maybe you aren't - I have no way of knowing - so don't feel I'm lecturing you if you do already know it). It's only giant hits like Ben 10 that get re-branded extensions.
The logical deduction to make regarding Batman: The Brave and the Bold is that its ratings and revenue are good enough for it to hit the 65-episode gold standard, but not so good that it's worth their while to give it a re-branded extension.