It only seems the obvious choice because it was touted as such, and because people are mostly clueless about how charges work (hint: having 2 charges doesn't give twice the number of casts). Having the bracers and not getting CW is mind-boggling. Even without them Prosperity does so little without SotF there is literally 0 reason to pick it. If you need back to back SM often then something is wrong, and CW->SM covers that burst healing if you need it. The 3s cd reduction is meaningless.
I can see a case for Abundance once you fill your artifact and have a stronger LS.