Eh, Esuna Debuff are only worthwhile in three situation mainly and maybe 4.

Paralyze=always want to try and remove this however not all paralyzes are created equal so you don't always have to waste your time removing that.

Slow=Mainly want to eliminate asap since it really does hinder with dmg

Poisons=depends on severity of poisons and how many targets, if the whole party is hit by a 20 second poisons that does 500 dmg overtime or even 1k, it's just easier to use Succor to absorb the dmg rather than waste the MP removing it from targets.

Bind=situational with mages not so bad, melee yes you want to remove it but overall it's a 50/50 use

Overall what really kills the esuna/leech aspect is inability to choose what you can remove, see the problem you run into then is 3 party members have 4 debuffs each, all of which can be removed and last 20-30 seconds. So if you were to remove all the debuff that's about 30 seconds and it is littled things like that that just don't make the spells as effect as they could be.

But of course there are "speciality debuffs" which should always be removed like Titan's debuff that occurs when a person escapes the rock prison.