Remember Merit Points in FFXI? Same concept but there was an optimal choice. You were given 5-8 options to spend merit points with a cap of 10 total, and each category had a cap of 5, so you could max out 2 skills or put points in all 8. Ultimately the best option for most jobs was to max out 2 skills because a few were amazing. DRG had Angon for example, an ability that when used reduced the target's defense by 20% for 90 seconds. It was excruciatingly useful because most similar skills were much weaker (5-10%) and could be resisted or miss, but Angon was guaranteed to land. This made DRG's other merit skills pointless to spend points in (mostly because they were crappy though). Other jobs had good skills, like RDM, which had 5 higher tier spells to choose from. They could max out 2 spells to 5/5, or spend 10 merits points and unlock all 5 spells, putting 2 points in each, etc...Ultimately 5/5 was the way to go because some were more effective than others.