Well in that case I do agree with you, those are definitely limits you can run into as well. Depending on the type of game you're going for you could run into that problem quite early on. Optimization of how entities are handled is really important and to some extent the A6 engine is a bit lacking here, but you'll know this.

However, stating that a game like this isn't possible with A6 goes a bit far and simply isn't quite the whole truth.