Each of my headphones or IEMs have different characteristics and are suitable for different things so I pick up whatever headphone is suited to what I'm using it for. Sometimes I just feel in the mood for a change.

I do see your point and do agree with you in a way, but they got a good present so let them just enjoy them. I have a pair, sure they aren't the best sounding for music listening even compared to headphones the same price or less but they aren't bad. Brilliant for recording, live mixing and picking out small details and very portable and practical with the way it can fold whilst not drawing much power and therefore able to be powered by mobile phones and other similar devices without a dedicated amp. Great studio headphones which is what they are designed for. I personally don't use them much for listening to music for enjoyment because of how narrow sounding they are and the comfort isn't the best but they are still great headphones.

Tinnitus will be caused if you have the volume too high for extended time periods, but with good noise isolation it's not difficult to keep volumes low.