Yes! It is possible to use HaxeFlixel as a framework for a 2D MMORPG. I've made a 2D MMORPG using HaxeFlixel and it's been great, I've never had any regrets about choosing HaxeFlixel and would use it again if I was starting a new 2D MMORPG project. If you'd like to check out my game as an example of an MMORPG made with HaxeFlixel, you can find it here: http://www.portalwalker.com

@sionco Haha, yes! As a workaround I've also done this, resetting the scale and X/Y of the textfields on resize, but it certainly doesn't look as good as when the FlxInputText (or TextField in my HaxeFlixel 3 build) scales on it's own.

I'm having the same problem (recently switched to OpenFL TextField from FlxInputText because it doesn't pop the software keyboard), and the crazy thing is that the TextField class used to scale properly in HaxeFlixel 3. It wasn't until I ported my game to HaxeFlixel 4 that I started having a problem with all TextField instances not scaling with the stage size. If anyone has any suggestions for how to get TextField instances to properly scale in HaxeFlixel 4, that would solve both of our problems. :)