only thing that makes barrier healing a bit rough is the cast times on adlo and succor imo.

if your newer to a fight and dont have the mechanincs fully down then even if you start casting succor the precise millisecond you see a bosses cast bar it's often already too late to shield that raid wide hit. a slightly faster cast time would at least give players more of a chance.

at the same time though it's not really a huge problem because that raid wide doesnt hurt to much anyway in 99.9% of the games content