TerrainSafe..
Yes Indeedy, LACC controllers can provide ATSOCAS (RAS/RIS/FIS) above FL70 in class G.
The thing is that they are usually not best placed to provide anything more than a FIS, usually due to workload inside CAS, which is after all the primary task.
Another reason is that Area Controllers aren't very practiced at providing RAS / RIS, and yes, I reckon it does take practice to do it well, practice that LARS units get daily.
So, apart from the "duty of care" aspect there doesn't appear much else to add. Thanks to all those who contributed. It's just possible that a lurker or two has learned something here.
Best rgds (to all). .BEX