Gibb Sahib - here I mostly agree with you.

For some reason Hugh Laurie singing the Blues immediately comes to mind..
Folks can guess my opinion on that...

I'm a product of late 1970s punk Rock against Racism, 2 Tone Ska,
and early 80s WOMAD..
I've developed my musical sensibilities over more than 40 years
of assimilating cultural cross fertilisation,
genre-bending, and more recent internet age enthusiastic loving mashup remixes.

Yes, by now music has become a free-for-all...
But the results can either enrich shared & willingly traded cultural activities,
or just be shit music made by untalented oafs...

For me the key words are 'sensitivity and respect' for the traditions of others.
But they are not absolutely sacrosact.. nor should they ever be...

There are 'world music' & 'Trad Folk' genres I adore,
but know I am not capable of performing well enough to do them justice
with any degree of authenticity,
or add any value from my own self indulgence...
However, I will appropriate stylistic elements from other cultures that engage me,
if I sincerely believe it will make my work more musically interesting...

For instance, I will raid East European & Klezmer styles,
I will be inspired by the instrumental studio FX sonics of Dub Reggae ...
My heart is in that, and for me those are fair game...

But I would not repeat the mistakes of those patronising white middle class diletante 'Tribal' & 'Celtic' dabblers
we know of and are embarrassed by...