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They certainly can provide uniqueness to some degree. GoatCounter [1] does that.

they do not have a kpi on "how long stayed the visitor on the page"

Sadly no, but that's a different KPI than "how many visitors you get on your website".

They don't, no. If optimising for that kind of thing is necessary for a business, then that business is in my opinion one that can go away.

It's like how search results are almost entirely rubbish now, because things are optimised for what Google looks for. So similarly, I have no sympathy for sites that need that kind of analytics.

Not a business. It helps to filter out crawler and bots. It tells me which content is interesting enough to read and worth updating (my personal wiki)

Are crawler access patterns really that non-uniform across pages and large enough to make this a problem? And for crawlers that are not immediately indentifiable from the user agent? Are you sure you are not just counting users without JS / a blocker that interferes with your tracking / intermittent connections as bots?

If you really care what users like on your site why not ask them?

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