That's absolutely true. For any instrument that you can alter the tuning of, use what works and sounds best for you. The discovery of CGCGCD for my guitar (similar to ADAD as mentioned above for bouzouki by Big Mick) has been a liberating experience for me. I'll give ADAE a try sometime, but when I get my new bouzouki, I might use FCGC (GDAD down a tone) with some heavier strings and, inevitably, a capo!