After using both the place-able aoe pw when on aeria and using the current pw that we have here on classic, I can definitely say that the place-able pw was a lot better. The issue about the current pw, in my experience, is that it's harder to gauge who is being debuffed and who isnt. As well as what was said in the original post - it'll help keep healers more at a distance and still be able to heal & pw in the backline and hopefully avoid getting cc'd as much/as fast as we do now.
But to be honest, if we're able to place an aoe heal then we should be able to place an aoe pw as well.
edit: i do think making it toggleable would also be a good idea.