It sounds like a big facepalm, and it kind of is, but it's not a crazy idea to filter your water at the taps: you probably only have 2-6 of them anyway. I'm a fan of the whole-home water filter, but yeah then you've gotta be confident about your pipes.
I'd choose micro plastics vs an equivalent mass dose of lead.
If it was 1000x the amount of micro plastics vs lead it's maybe less obvious which is the less bad poison. I'd have to do some research at that point.
I think framing it this way it's obvious that lead is worse than micro plastics. But when you go from lead soldered copper pipes to PEX I don't know what the doses you get from each are.
Maybe if you said a billion times.
The reason we know there isn't a safe dose of lead is a lot of study.
Every month there's a new study about some crazy micro plastics things where they got found in some new place. We're in the early days of figuring out how bad it is. We don't really know yet.