I'll preface this by saying that I agree it would be nice to see FF14 get a bigger budget and it does feel like in at least some aspects we are getting less content than we used to (regardless of how many power point slides they show).

I think there's a couple things to keep in mind here. First, even if FF14 did get a bigger slice of the pie, it wouldn't instantly translate into more content for FF14. SE could drop hundreds of millions of more dollars into Yoshida's lap tomorrow but he'd still have to go out and find the quality capable staff. They'd still have to train and onboard said staff. They'd still have to plan out and manage the content. They'd still have to actually create and test the content. Etc. It's not just a case of FF14 getting more money.

Second, as others have mentioned, it's a necessary business expense to put some if not most of the income from successful projects into other projects. Bear in mind that FF14 was one such failure not that long ago. It was a complete money pit that involved running a dead game while simultaneously developing a new one all while collecting no money from the people who were still playing the game. The game sucked up likely hundreds of millions of development dollars and many years of resources only be basically end up clogging up the office toilet. It was only through funding from other projects at the time that FF14 as we know it today exists.

Now, will Babylon's Fall or Chocobo GP be the next ARR? Probably not. Was Avengers a complete waste of time that should have stayed a single player game? Sure. Was there any way Balan Wonderland was going to be anything but a garbage fire? Yeah, I don't think there was any way to save that. But sometimes you do have to throw good money after bad.