"Was "Rolling in the Deep" soft? Not really.
Guys, what current songs on the CHR or Hot AC chart do you consider "soft" enough for AC to play? If you're looking for ballads, there are extremely few on the charts, and it's been this way since the 90s.
You're trying to feed a format with songs that just aren't there.
AC needs to be "Contemporary", and the well of soft, contemporary hits is basically empty (with maybe just a couple of exceptions). You can't feed the AC format with soft classics from the 70s, because then the format wouldn't be Adult Contemporary