Agreed. I've never seen anything about lack of budget. What some speculation has been though is that they are putting more of the budget on a future game. When we saw that they announced the graphics engine needs upgraded but they want to wait, combined with the idea of them having been recruiting for a project following FFXIV, it might be that they "end" FFXIV with Endwalker and then move on to something else that will have the better graphics and other things involved. If they do that, it'll be interesting to see if we start off from scratch or if they'll build it on top of what we have somehow.
Btw, sources of what I'm talking about are
https://www.rpgsite.net/news/9790-fi...s-as-fake-news
https://gamingbolt.com/final-fantasy...engine-someday