They did explain their design decision for healers back in shb.
https://twinfinite.net/features/ffxi...ers-interview/ TL;DR healer balance was dire and they wanted to fix it.
And of course the infamous
https://www.youtube.com/watch?v=WRpdIL7_NII&t=17438s
I am also 90% certain they talk about it in the combat pll for shb as well but I am not willing to comb through a 4 hour video to win forum arguments. I am also not willing to comb through dozens of media tour interview videos and articles for the same reason. You can fall down that rabbit hole yourself if you're so desperate for answers.
All that said, I would like for them to address it again because why not?