False Scholar comparison

[Lastelli]

This class has intelligence as mainstat and thus as trait

The traits you want to consider are maim and mend I and II that have the following effect respectively: "Increases base action damage and HP restoration by 10%" and Increases base action damage and HP restoration by 30%.
The intelligence trait increases your intelligence for a grand total of...12. Ceteris paribus, this makes SCH 12 mind points behind AST and WHM. The difference is negligible at best...and you always have a pet that outputs a 300 potency mp free cure every three seconds. Only considering one single point and forgetting to take into account the whole healing toolkit of every healer when making comparisons is misleading and useless, which leads us to the relevant statement in the OP:

The Scholar´s skillset is still the most rewarding healerkit if played well and makes up for this drawback with ease.

Thank you for acknowledging this...if you really want to call this minuscule difference in mnd a "drawback".