You missed the point.
Because you can essentially maintain a permanent barrier on the tank AND maintain the same exact damage you'd deal spamming Dosis III for only 100 more MP, you're at a significant advantage over every other healer. It can't just be free or SGE because the only healer who's DPS spam also heals and shields your main tank constantly. There needs to be some combination of restrictions like cooldowns or other action combos or it becomes absurd.
