With SHB you can argue that the pandemic kind of got in the way of stuff. Which it did. But eventually they got back on track.
Square insists FF16 isn't getting in the way of 14's development.

We're actually having more time between patches too, we should have a similar amount of work brought out.

Caveat to consider: they're working on content that will be released in the future, which likely requires a lot more work to be done than the features we've seen now.