No, there isn't. This is the clearest case of black vs. white you're going to experience all week. Blocking Meta is not "sticking our heads in the sand." There is literally no benefit for us allowing them to integrate with any of our explicitly non-corporate platforms. But there is a huge (and in their eyes profitable) benefit for them. If there weren't, they wouldn't try. So answer me this, what do we actually stand to gain?
Bots? Misinformation? Having our content redisplayed on Threads for profit? Ads? Corporate accounts spamming us incessantly? Corporate moderators, corporate instances, corporate communities where all the messaging is controlled? Having our content used to train AI's? This is all the crap we escaped when moving here, rather than using the existing social media network products. What, is Mark Zuckerberg going to cut instance operators a check to help with their overhead expenses for all the content he'll steal? Don't make me laugh. You can see posts that were made on Threads? If anyone actually wanted that, they'd just use Threads to begin with.
The argument is that Meta integration will allow the Fediverse to become "mainstream." Well, Lemmy and Mastadon are already doing just fine without Meta. They will continue to do just as fine without them in the future, barring any catastrophic reddit style administrative fuckups on any major instance(s). Meanwhile, there is enormous risk in allowing Meta to have their way with us, our platform, and our content. None of the other hot air matters one bit no matter how it's phrased. It will be much healthier as a whole for Fediverse platforms to grow organically without corporate (and frankly, evil) influence. And if that means they remain smaller communities now or even forever that's okay.
The openness of the "open web" stops precisely before bad actors are allowed to co-opt it for evil purposes. Companies like Meta always have as their end goal a closed walled garden for their users remain trapped in to have profit extracted from them. Well, let them have it -- on their own, without us. We need to set the precedent that those of us who give enough of a shit to use Fediverse platforms in the first place cannot be bought or sold. They'll talk about "openness" now but I guarantee you the design is for that to be a one way street.