Actually it is not a technical limitation that hold us on - we use indeed NWjs so you can have as many popups as you want but we just don’t want 
We feel that Wappler should behave as a single app and not be breaked up by thousands of popups and floating panels. This is just a very bad UX.
With the years of experience that we have on similar UI’s in Dreamweaver, we learned that it is not a good idea to give to users too much freedom in completely reposition and redesign their workspace. When they do so - panels get lots or are found in places no body is expecting.
So the support guys were 90% of the time occupied with questions like where can I find this and that panel - of it is hidden, of sorry I placed it somewhere else…
So we simplified things in Wappler for the greater good. Now we can say - look at the left side or right side and we now what is there