Sand flare isn’t a 100% selfish heal skill though; it grants that barrier to 4 other allies *and on top that,* converts a boon on up to 5 nearby enemies. Similarly, the heal on fb’s *mantra of solace...*
Having barrier be affected by healing bonus would be nice, but it would likely chain code it to be affected by poison, agony and other heal-related debuffs. Current numbers would have to be altered or even nerfed to compensate. At that point, what would be so special about barrier when it could just be straight up healing instead?