Jesus Christ, all this because he said any competent player with a pulse can infini-time solo even with all lights capped?
Protip: They can. It is nowhere near the realm of "POIDH", or "Getting 90 and an Emp in a day". Staying in Abyssea is stupid amounts of easy and any half-decent player, on any job, can make positive time if they need to.
Will shitty, inefficient jobs be stuck farming time more often than fighting NMs? Possibly.
Can they still hit a positive net gain in time? Absolutely.
