Why not just example.com [domain name], besides https, http and www [protocols] in google console?

I want to ask few questions related to the Google Search Console (GSC) and Google Analytics (GA).

I just added my website to google console as example.com.

Now when I try to link my google console with Google Analytics (GA). It says no property is added to the console. Perhaps google analytic is right because I have not added any property in fact it was my domain name (example.com). To link my GA with GSC I have added these properties:





(all of these 4 properties redirect to my domain example.com. Why?)

Not able to add wwww.example.com in GSC as property because it does not allow.

Now, after adding all 4 properties of my domain GA shows these properties when I try to link GSC with GA.

So, which property I should choose to link with GA (e.g., HTTP, https) because if I choose https://example.com as I did for my website, What about other properties. Will GA show me the data about other properties all of which land on example.com (domain).

Why add so many properties to GSC when they all land on the domain (example.com)?
Do I need to add a separate zone record (c-panel) for verification?

In simple words, why to add so many properties when example.com (domain) is more than enough.

Best regards,