Pls create zones in the toolbox on modern pages to discern between the oob responsive webparts and the legacy add-ins (app parts) introduced
You just introduced the ability on modern pages to show add-ins and app parts. Ok, great thing so far, but pls put a kind of delimitier in the toolbox of the modern pages between the oob responsive new modern webparts and the "legacy" add-ins (app parts). Without such delimiter (be it a line or anything) it is really not easily discernable for the users creating content on a page which webpart will be responsive oob and which may be a problem on small devices. To really get the mobile first strategy going, you need to make sure it is easy for content managers, users etc. to know which webparts are oob responsive and which may prove difficult. As an example, non responsive apps from the SP store integrate in the same "layer/zone" as the oob webparts in the toolbox. This is really horrible user experience.
We’ve rolled out the large toolbox to First Release users this week. AppParts (components of add-ins) show up in the Other section, while other modern web parts are categorized. All of these tools are of course easily accessible via search.