If you like leveling for the sake of leveling, Shadowbringers will have 17 jobs, 1 limited job, and 11 non-combat classes you can level. Also, +exp gear is optional; nothing compels you to wear a single piece let alone a full set, and your first job levels at a +0% base xp modifier. Subsequent jobs get an armoury bonus because it's assumed that you want to get that job current ASAP; for the vast majority of players, this is a fair assumption.