It looks like a well executed product, but I believe the future is to move towards running in the browser only, rather than browser wrappers for the desktop. For example, isn't just visiting a URL in your browser so much more easy and convenient than having to have an installer? Isn't it nice to use the already-installed browser rather than ship a full browser engine with the app?
We put our money where our mouth is as we develop Construct[1], a fully browser-based game development editor. It's only available in the browser. You can install it in Chrome and Edge so it looks much like a locally installed app. We actually used to have an NW.js wrapper for things like file system access, but browsers now support enough features (including the File System Access API in Chrome/Edge) that we retired the NW.js wrapper and just do everything 100% in the browser now. It works great for us and I think it will only get better.