I think you have a little confution there, a web app and a web service are the same for xojo, neither have GUI and both are console app. Yes, the service has much less traffic per client (no HTML CSS, etc) but web Services normally have more clients.
In my case, The first time I replaced Xojo was in a proyect, I had a web app with 20 concurrent users tops and Xojo Handled ok, but the web service could have 500+ concurrent conections and xojo couldnt do it
That’s the point. Why bother making helpper apps and/or ballancing many instances when B4J creates a multithread server?
It took me much less time to make the port than the time wasted attempting balancing the Xojo app, Much better performance, familiar sintax, lots of libraries out of the box and… it is free
https://www.b4x.com/android/forum/pages/results/?query=[server]&page=1&prefix=0