From my testing experience,testing by run by browser is not enough.even testing by a few device is also not enough.your app might still crash at internal testing,production testing.so i recommend testing through bluestack.it can pick up couple of bug(s) easily…
My statement might not be accurate,but testing on one more platform is always a good thing.
I found Bluestacks very helpful testing a PWA apk with made with PWABuilder. I could not get the app to run on an android phone. Bluestacks showed that the url was incorrect. In addition, because Bluestsacks was running on my Win 10 in landscape, another issue was starting up in this mode as an Android device. Also, it was easier to load the apk vs a phone.