Could just be me, but I like having everything on the same playing field in terms of leveling.
AST/DRK/MCH- Starts at 30
RDM/SAM- 50
GNB/DNC- 60
RPR/SGE- 70
VPR/PCT- 80
Its just all over the place and I feel like all jobs starting at the same level and make them more obtainable by starting at 30.
30 to me ( or at most 50) is a sweet spot, still within ARR and players can play the jobs they want from the start of their journey.