Yes, in general, if one would be so much cautious about privacy, then our browsers would not come with the normal browsing tab at all. It would by default contain incognito :p
We, all of us, mostly, don't care about our privacy. You are right about that. :)
Well yea lol.
Only reasons I (or any of my friends) use incognito is to login through a second account without logging out, or when a common PC is shared by multiple users