I wonder if the A343 will even be part of the potential rework. Given that the devs have chosen to rework only the 777 variants that are already in game, chances are, only the A340-600 will be reworked.
Well, back then the issue of ETOP’s was still prevalent and with four engines obviously the A340 could get around ETOP’s. However, twinjets eventually became the norm (B777) and their range increased, allowing them to fly further away from diversion airports and consequently ETOP’s extended. The economics of twinjets will always be superior to quadjets, but for a quadjet the A340-300 sold decently.
The purpose of ETOP’s really is for safety. Back in the day there was a common notion that it would be dangerous to fly a twinjet across the atlantic, hence quadjets made more sense due to the redundancy having four engines provided. Otherwise not sure what you’re referring to.