It seems a bit insane to me that pregnancy leave is something we Americans mostly leave to the discretion of employers. If we as a society care about it, we should back it up with public dollars and public policy.
That aside, unemployment payments are funded as a completely separate system to every other kind of welfare in the US and so they demonstrate nothing at all about how other payments could be afforded.
I was comparing US unemployment benefits to the UK
American health insurance is usually tied to your job. If you lose your job, you can continue it, temporarily, through a provision called COBRA, but it is often outrageously expensive.
In the UK, I believe you’re able to access the NHS regardless of your employment status (right?). Equivalent insurance would cost you hundreds of dollars a month in the US, if not more, and would have to be paid from your benefits. An apples-to-apples comparison between the two system ought to include that fact.