The word-of-mouth problem
People must remember where the hyphen goes and may type the unhyphenated version by default. That matters for radio, podcasts, phone conversations, and referrals.
When a hyphen is acceptable
Hyphens can be reasonable for certain descriptive projects, local initiatives, or markets where the format is familiar and the matching unhyphenated domain does not create brand confusion.
Compare stronger alternatives first
Before committing, compare a cleaner brand name, a modifier, another extension, or purchasing the unhyphenated domain.