it really is this simple. We have data. Data trumps anxieties.

No one is saying lead is good to eat. But your fears of consumption are almost entirely irrational. I had regular blood lead checks done on my daughter still, with no issues. Unsurprisingly.

I've worked on plenty of non single family homes. Lead is very easy to deal with. It requires dealing, yes, but it's really not a big deal. A few thousand dollars in equipment. It can be done perfectly safely DIY also. Or unsafely of course. But it's really like crossing the street - you can get killed, but it's easy to cross the street safely. Doesn't mean everyone does of course.

You can lift a multi. But you wouldn't. You'd prop it up and fix the issue. no need to lift. Lifting is a pain even for single family houses. Very few old buildings have foundation issues, they are much more common in the newer places for various reasons.