I'd be careful about being too confident about masks. I'm 100% pro mask. I think we should all be wearing them inside and out. (Again, no fighting, just my opinion.) But.... while they certainly help (or so the scientists tell us, and I believe them), they aren't a guarantee. And the problem is that Delta is so much more contagious.
I think about it like this (again, I'm not an expert, so don't trust me! I'm just telling you how I think about it based on what I've read and heard):
Imagine that you're going on Splash Mountain. You have a sensitive cell phone in your pocket, and you don't want it to get wet and ruined.
If you have a disposable plastic poncho with you, you'd probably throw it on. Some nice protection against the water. Is that a guarantee that the phone makes it through OK? No, especially if you just tossed it on haphazardly. But it's still a pretty good help. And if you're very careful and fit it properly and tuck it in all the right places, then even better.
That's how I imagine it before. Any mask is a big help, a really good, properly fitted mask puts in you good shape.
But with Delta, we're not going down Splash Mountain anymore. Instead, we're spending 4 hours outside in tropical rain downpours. The intensity of the exposure is just a whole lot stronger. With nothing, I'm a sitting duck (see current wave of infections). But does my disposable poncho work? Surely it's much, much better than nothing. And again, if it's all tucked in and fitted correctly, much better yet. But hour after hour of strong rain? Well... I'm not so confident. Any mistake on my part, any little seam or whatever, and pretty soon, water is leaking in, my clothes are starting to get sopping and my phone is at risk.
That's how I imagine Delta. Just way more intense and much harder to keep at bay.
I like the "layered defense" idea. Now imagine that in addition to the poncho, you have water resistant track pants on with a zippered pocket. That's being vaccinated. Not waterproof. Not a guarantee. But one more solid level of protection. So when I'm out and about, I'm in the best N95 or K95 mask I can get, I fit it as well as a possibly can, I stay outside when I can, and I'm vaccinated. That's layering my safety. I've got the poncho on, tucked in as well as I can get it, and my phone is in my zippered, water resistant track pants pocket.
With all of that, is it OK to go Disneying? I really want to go to the parks, but I really don't want to "toast the phone" (i.e. catch Covid).
How much risk is too much and how do we handle it? Who knows. That's what we're all here undecided about. I don't know either.
What I do feel confident saying is that the only way to guarantee that you'll be safe is to stay out of the parks. Any other choice involves some degree of risk. Then again, so does getting out of bed in the morning.
¯\_(ツ)_/¯