Earlier quoted context omitted.
If you're doing 1st-party tracking, and you are collecting personal data for that purpose (which is almost by definition going to be true), and the user hasn't explicitly asked for that tracking to take place (for instance by creating an account and logging in, or by putting items in a shopping basket and expecting them to be retained) then yes you will need to ask for consent to do that tracking. The test isn't whet…
I was referring to the grey area of legitimate interest in the law and how I was briefed to interpret it ca. 2021. Things may have moved on and I am not a lawyer. You might be right and what the lawyers told me back then isn't true or was true and is no longer considered true. What I was basically saying is that 1st-party cookies are considered more likely to reflect a legitimate interest than 3rd-party cookies. And…
Even an IP address is PII, your may be lucky with some fingerprinting, but this won't be unique.