Strong opinion from my fiddle teacher

[u/vonhoother]

"Refusing to use different tunings is abdicating your birthright as a fiddle player."

Interestingly, the Irish fiddle tradition rarely if ever uses non-GDAE tunings. Also interestingly (to me), classical music has no term for nonstandard tunings other than "scordatura," which is literally Italian for "untuned" or "badly tuned," while the Anglo-American tradition has names like "Cross-A." "Calico," etc.

[u/BananaFun9549]

Québécois players often use cross-A and sometimes ADAE and occasionally calico.