Refine "why this add-in" about what developer-oriented means

README.md

@@ -9,8 +9,11 @@ Developer oriented Excel add-in that provides `=OAI.CHAT_COMPLETE()` and helpers
 - Free - use your own API key
 - Confidential - calls go directly to OpenAI's API
 - Comprehensive - supports all models and parameters
+- Observable - view and use all API request and response data
 - Open source
 
+Built with generative AI developers in mind - other products are available which may be more suitable for using generative AI in general spreadsheets. As a rule, we don't include convenience functions for tasks that can be reasonably accomplished using built-in Excel functions.
+
 ## Installation
 
 Add the add-in to Excel by following the [sideloading instructions for your platform](https://learn.microsoft.com/en-us/office/dev/add-ins/testing/test-debug-office-add-ins#sideload-an-office-add-in-for-testing) (it isn't published to the Office Store).