I feel like chrome apps were actually ahead of their time and very much better than embedding a full browser per app with electron. Of course, they were not perfect but IHMO made much more sense than what we have today, at least on a technical standpoint and could have evolved into something truly great.
I.i.r.c. Chrome Apps are compiled binaries specific for Chrome (NaCL), they're more like Flash, Java or Webassembly applications.
Because of that, Google's suggested replacement of Android Apps (won't work everywhere Chrome does) or PWAs/Extensions (both heavily sandboxed) doesn't work.