Using old compositions: Blasphemy or inspiration?

The geniuses of former centuries have left a wealth of compositions, many of which are being used for formal musical education.

To what extent may old compositions be used for inspiration towards modern compositions and productions with “unsuitable” instrumentation?

Is there such thing as a “netiquette” in composing, i.e. would it be blasphemy to take a sacred Goldberg variation and instrumentalize it using modern synths and rhythms and professionals would just not do this, as much as a spray painter should not try to mimik Edvard Munchs “Der Schrei” on a train station wall (although some graffiti immediately carries that association)?

I think there are many answers to this question.

I personally love hearing old compositions transformed into more modern versions with todays electronic capabilities. I just think it’s cool. I don’t really find it offensive at all.

On the other side, I can understand people who do not agree with it.

Different flavors for different people.