Almost everything in this game is hindered by the connection cap being so low, lifting this cap is probably the single upgrade that could happen to XI.
Considering XI makes many millions of dollars a year and has a very high profit margin, is guaranteed to last a long time to come (players aren't going anywhere if they stuck around this long) and that it is run by a large company it's wild there is so little interest in fixing this.
I understand the game was "coded poorly" originally, before there were a lot of standards and so they attached many game systems to the 56k connection (cause they didn't think it mattered, since the game wasn't going to be around more than a few years) but surely Square Enix can put a coder to work on the game for 5-6 months to do this job?
The game makes around 7-8m a year and most of that is profit due to the staff numbers being so low, they can pay a coder to work exclusively on lifting the data cap. A game with 40k+ subscribers from a major company, still having a 56k data cap is embarrassing.
Even if the cap is only raised in instanced areas it could be a huge improvement.