Perception

This is fascinating and I think reflects differences in taste.  For the OP, who cares what your friend thinks.  People not only perceive things differently, they have different tastes and there is no objective definition of good sound.  

I personally like sound that is forward to a point where there is wonderful detail but it can't cross the line from forward to bright.  A hint of tinnyness or if the tweeter has a metallic edge, I go from enthusiastic to repulsed. 

Alternatively if a system is dark or laid back, I find it inoffensive but am never going to be wowed.  

Now, I know folks who are less sensitive to higher pitches and their line for brightness is different than mine.  I know folks who love a warm, laid back sound.  In both cases, good for them.  

If you like it, everyone else can go pound salt.  Think of it this way, would different upgrades make you happier or your friend happier?    

Scientists are working on ways, to help those with hearing problems, as an effect of their genes, whether damaged through mutation or inheritance. https://mediu https://www.hear-it.org/genes-dna-and-mutations-and-hearing-loss For the time being; I’ve avoided washing mine in hot water, or drying with excessive heat. I’m also eating a lot more cheese. https://jacksdailydose.com/2017/06/19/hearing-loss-protection-from-cheese/ Those affected by tinnitus, might want to investigate that last reference.

The dismissiveness of other opinions is interesting. Especially so, when opinions are so readily and abundantly proffered here. : )

Being open to feedback, trying to understand it and learn from it, is wise. I see it as one aspect / factor in our development along our audio journey. Evaluate it in context to yourself.

Not that I needed a reason to eat cheese, now I have an excuse. Thanks for the link.

Pounding salt is also good advice.