Before we even think about tweaking the QoL features regarding FW, I believe we need to address the elephants in the room:
Firstly. We need stronger heroes than 6*, and we need stronger gear than 6*. Plarium are offering 6* gear sets for (What I believe to be) the first time ever. Is this a sign that we might be seeing 7* heroes and gear in the near future?I hope so because I don't even look at FW because none of my compositions can get past stage 7.
As a newer/intermediate player whose made reasonable contributions to the game (£150-£200?) some of the factions I have acquired multiple 5* heroes and a 6* main within and still can't beat stage 7, and on the other end of the scale, the wales and OG's of the game have NO chance of completing Faction Wars with fully geared, ascended and maxed out 6* legendary compositions. The release of 7 star upgrades for equipment and heroes would be a massive bonus for all players, new and old, cheap and rich. Perhaps you could release a 'Nightmare mode' for campaign to coincide with this?
Secondly, it has been touched on many times here and I know Plarium currently have no interest in implementing this feature, but I think they need to bite the bullet and listen to the player base. Artifact swapping. It cannot be done, we cannot afford the silver to swap champions gears around for FW due to the extortionate costs, the games inefficient ways of earning silver across the game cannot support players attempting Faction Wars.
Thirdly I would like to extend my support to the players calling for extra inventory and vault space. I needn't go through the reasons why as they have all been stated.
Other necessary tweaks: Upgrade the reward system. Provide other avenues of receiving crypyt keys ONLY if the rewards are buffed otherwise it is dead content as nobody except END game whales are interested in FW right now.
Summary: There are a LOT OF OTHER issues that NEED to take priority in other areas of the game over these small QoL features that Plarium are pondering on regarding FW. I would say that currently only 1% of the player base which is not an exaggeration, is interested in QoL features in Faction Wars, because the massive whales are the only ones that can get anything done there, and IF you ARE only interested in tweaking faction wars, you need to look at the buffing rewards and balancing the scaled difficulty before you begin to think about tweaking anything else. Trust me, you have a shot at making a massive portion of the community MUCH happier in game and Plarium needs to act fast before it is too late. Don't let this great game die.