I think you made my point for me, at least partially.
The real teeth in a union is the ability to strike. In joining a union, you signify that you're willing to strike if enough other people aren't getting what they want.
I'm happy with what I have. My team seems pretty happy, too.
If things were bad, I'd consider joining a union. But until they are bad, union dues are just wasted money, and the obligation to strike if enough others want to.
I think you've also pointed out the need for unions, though. Lots of employees literally can't afford to strike because it means they don't get paid, even if it's temporarily. That means that your assertion that "if enough others want to" is kinda meaningless.
The real teeth in a union is the ability to strike. In joining a union, you signify that you're willing to strike if enough other people aren't getting what they want.
I'm happy with what I have. My team seems pretty happy, too.
If things were bad, I'd consider joining a union. But until they are bad, union dues are just wasted money, and the obligation to strike if enough others want to.