I was looking into B4XPages and I saw that when you show a page, the previous page is *immediately* removed from the screen.
This poses a problem when it comes to animations. You can let the new page slide in, but you can't let the old one slide out since it doesn't exist anymore at that time.
So if you want to slide in and out pages - which is something pretty basic in Android - that is impossible to do with B4XPages.
I don't know how B4Xpages is made, but would this be something that can be added? It would certainly make some apps look more professional (at least my apps, I won't speak for others)