SCH lacks a single target mitigation ability

[Supersnow845]

Why would you even waste Recitation for an Adlo on the tank when you could just use it on Excogitation?

Multiple reasons, savage tankbusters can be a lot less risky with critlo, you can deploy that critlo before the tank gets hit for a subsequent raidwide, for some mechanics taking zero damage can nullify the subsequent DOT, if you have other healing buffs like natures minne or krasis a critlo can absorb more HP than critcog restores etc

The only downside is adlo needs a GCD