Add Tom's feedback

README.md

@@ -212,7 +212,7 @@ Of course, you don't need to use esri-loader to load the styles. See the [ArcGIS
 
 It is recommended to try installing [@arcgis/core](https://www.npmjs.com/package/@arcgis/core) and [building with ES Modules](https://developers.arcgis.com/javascript/latest/guide/es-modules) and _instead_ of using esri-loader. It's also pretty easy to [migrate applications built  with esri-loader](https://developers.arcgis.com/javascript/latest/guide/es-modules/#esri-loader).
 
-<a id="why-is-this-needed"></a>esri-loader provides a way to dynamically load the API's AMD modules at runtime from the [ArcGIS CDN](https://developers.arcgis.com/javascript/latest/install-and-set-up/#amd-modules-via-arcgis-cdn) into applications built using modern tools and framework conventions. This allows your application to take advantage of the fast cached [CDN](https://developers.arcgis.com/javascript/latest/guide/get-api/#cdn).
+<a id="why-is-this-needed"></a>For versions of the API before 4.18, esri-loader is required when working with frameworks or bundlers. esri-loader provides a way to dynamically load the API's AMD modules at runtime from the [ArcGIS CDN](https://developers.arcgis.com/javascript/latest/install-and-set-up/#amd-modules-via-arcgis-cdn) into applications built using modern tools and framework conventions. This allows your application to take advantage of the fast cached [CDN](https://developers.arcgis.com/javascript/latest/guide/get-api/#cdn).
 
 esri-loader provides a convenient way to lazy load the API in any application, and it has been the most versatile way to integrate the ArcGIS API for JavaScript with other frameworks and their tools since it works in applications that:
 - are built with _any_ loader/bundler, such as [webpack](https://webpack.js.org/), [rollup.js](https://rollupjs.org/), or [Parcel](https://parceljs.org)