But what is even wrong about them being Level 1?
(----cut for brevity----)
and for everyone else its seen like superspecial überCool background.

I wonder why?
Look, these are very fair points but when you list them as above it precisely highlights my issue...they are all exceptional. Compare to the characters in BG2...Aerie is an example of a rare race as was Haer'Delis and Viconia...the rest were for the most part more down to earth and relatable. Sure, they all had stories but to my memory none approaching the kind we see in BG3.
I had forgotten about Karlach (supposedly a recruitable companion)...so again we will have another level 1 character whose history is fighting battles in the Hells. That's a hell of a backstory (pun intended).
We will just have to agree that we have different opinions on the matter; I find the companions OTT.