Spreadsheet warriors asked for this, so SE obliged them. We used to have more support, more job synergy more Individuality but then someone broke out a calculator, declared a certain job combination suboptimal and a few years later this is the result. Blissful uniformity.
People also bitched about melee uptime so SE made bosses bigger.
Honestly, I don't envy them. No wonder they stopped replying in the EN forums years ago. lol