Yeah but mp on hit works very well with resource mythic such as Discordance, sometimes energy (if you use it up so fast) and alchemy especially. Even before energy was based on missing aamp%, MP on hit was even better.
Also hp on hit for bloodmagic or MP on hit. Bloodmagic has been buffed to give almost 200% increased DMG at lower HP and it can work with masochism or so. You would need enough HP to cast and resource cost so it wouldn't be worth it and especially when there's Push the Limit and other factors.
Bloodmagic still has some potential left in it though and for PvP it has potential as well, especially when buffed recently.