This seems like the reason FFXI is a great game though. It's not set on a certain way to play. There are so many different styles/ways to level, play and have fun that so many different people can play this game. If you force everyone to play the same way you alienate others. I think the group (most likely a minority) we are forgetting is those people who just like to explore. There used to be many at the beginning of FFXI. People who would just run around and explore and not worry about jobs or levels or grinding. Just wanted to do quests or explore the world and take pictures and look at everything. At level 30 whm you have sneak and invis which will allow you to go into abyssea and explore and not bother anyone. You raise the cap now those people have to endure grinding (which might not be fun for them) just to get to a new area to explore.
Edit: Also if they leech a job to 90 that will allow them to do more questing and missions solo to explore more content by themselves and possibly never bother anyone.