为何说摩根斯坦利的瑞士私人银行业务是亚洲私人银行业务的补充？

Morgan Stanley weighing sale of Swiss private bank: source

Morgan Stanley has made changes to how it has organized its private bank in Asia, for which Switzerland was originally intended as a platform to expand, according to the source.

提到了瑞士的'私人银行业务只是亚洲的私人银行业务的平台扩展。为什么出现这样的情况呢?

另外摩根斯坦利也在 2013 年剥离了自己在欧洲、中东和非洲的私人银行业务，这是为什么呢?

欢迎业内人士来说说其中原委，如果非业内人士，也希望是有理有据，而非自己的臆想和猜测。