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The RESTful EWS Gateway API was designed in a provider agnostic manner. As a result, it was known that not all Providers would be able to support all methods.
The limitation for the SoapEwsRestProvider is that it uses EWS under the covers and EWS doesn't allow a way to "get all Trend Logs in a system" in one call. The only workaround is to browse the object tree yourself. As you can imagine this could be a very chatty endeavor and that is why it wasn't considered as a workaround for the provider. In contrast, the MongooseEWsRestProvider has direct DB access to its data source so it can easily support this method.
Current development on a native SBO provider should alleviate this restriction. This will of course be a different provider, but it will use the exact same API.