GMS Luminous Discussion

I've kinda learned why people are saying that. It's because of lunar tide.
You want to keep your current HP lower than your current MP so you can get the Damage buff instead of the critical buff. It helps quite a bit with Ender, seeing as it hits 100% criticals.

it's kinda hard to have less mp that hp to be honest.

I personally just use an nlc pot if I get close. Plus with all the free pots from those boxes that drop all the time it's pretty easy to keep yourself in potions.