If player A quits because player B is able to enjoy the game more... than player A is the problem, not the solution.
I'd play more if my favourite jobs were useable in more content. I'd play more if I could make more progress when I did log in, instead of being walled off by not using 3rd party tools and not already having all the best gear. I am not seeing how making it less grindy to get chapters solo makes player A quit... those people are already capped on AF/relic they want, so making it so I can get it doesn't hurt them at all.