You aren't going to start noticing the Jobs transform until around Lv.70 once you get to the Stormblood stuff and they iterate until level cap where they expand on the toolkits established in that expansion. This game constantly changes how Jobs feel every expansion because to prevent button bloat they tend to shift all the best skills/abilities/spells to the endgame which makes sense but as a result it makes early game feel slow and unfulfilling.