So any show where the heroes are incapable of solving their own problems and need to call in outside help is boring? I really don't think that's what you mean to say, because it's pretty much the exact opposite of what makes sense to say. Of course the heroes need to feel outmatched in the first few acts, but generally they're able to rally and beat the bad guy on their own, rather than needing to call in bigger guns every time.
But this isn't street vigilantes stopping bank robberies. It's otherworldly, God-like beings who see the blue marble as exactly that. The things that outmatch them or epic on a galactic scale capable of mass destruction and loss of life. It would be criminal for anyone to try and fight it alone out of pride and a need for self perseverance, when help is otherwise available.
They can keep that stuff out of the show, of course, and stick with freaks of the weak. But that road's been driven on. It's long, dull, and painfully repetitive. A show like that won't last a season on CBS.
The natural progression of series escalation suggests it won't remain that way.
Besides that Berlanti and Co. love opening up the DC playbook. There's some pretty nasty nasties in there. Eventually one will come along with such destructive potential that it will seem extremely irresponsible for her not to call for help. And the question will be asked why she didn't.
Again I reference last night's Flash. Barry found himself in a situation he knew he couldn't handle alone because there were so many lives at risk. So he brought in help, even if he knew it to be unreliable. When that didn't work out he called in the "big guns."
Now imagine that episode as-is but with Barry doing everything himself. It would have been totally unbelievable and a massive super speed jump over 27 shark shaped busses.
Or, they rewrite the episode such that he
can do everything himself. He super speeds the prisoners off to the island--maybe one or two escape. He super speeds Eddie to safety. Then chases Wells around in circles for a few minutes before snatching him by the hoarse collar. The whole audience falls asleep, only to wake to find Wells really wasn't the threat the season was building him up to be.
This phenomenon of self-containment (It's almost like small world syndrome in reverse.) has always been a big issue for me with comic book stories.
I mean, imagine a really bad fire breaking out and the local engine group not having the dispatcher send the cross-town companies because the fire is in
their neighborhood and they want to handle it themselves.