This is not a matter of opinion, argument. Google is not the only company out there which tracks users across websites and which operates an ad network.
They typically do that with logged in accounts, because that is without a doubt the most accurate way to determine unique users.
Ungoogled chromium doesn’t provide anything special in this regard as the properties exposed by Client Hints API can be determined through various JavaScript APIs in the browser. It is trivial to make a website not function unless you have JavaScript enabled.
If you read the later replies you’ll see that disabling those things breaks functionality users might expect to work.
TLDR not having client hints doesn’t mean your browser is magically not fingerprintable.
As far as security goes this browser doesn’t have automatic updates whch also means updating the browser is now your job if you use it.