listed it (in other terms) as one of his four elements of "Capital"...there are many, many articles on this topic, but just to give you a sense of where I'm coming from, here is one from the "Harvard Business Review"...not 'all-encompassing', but because it includes references to the effect of low wages on human productivity, I chose it to share here.
You're not at all alone in the perception you project, so I'm hoping you'll stay with this discussion, and that several others will join in...hopefully, with the end result of more understanding of how such expenditures as you see in the BBB Bill, fall under the heading of "Investment in Human Capital".
Remember, human productivity is a driver of GDP...and we all want that measure to grow.
Link: https://hbr.org/2017/09/the-case-for-investing-more-in-people