Lord Tirian
Erratic Poster
This is a bit of an issue, though and should be re-designed.Also why would anyone pick a backloaded religionfocused piety tree over something that actually helps them win the game?
But your arguments could equally apply to Patronage - why invest in it when you get the more valuable Rationalism tree soon after? By moving Piety into Classical, we get two interesting but niche trees in Classical giving you additional decisions: stick with your first opened tree or abandon it?
Since they come later, we can also improve them a bit (as they're now competing with the later policies in the initial three trees), giving us more design space. Finally, if we only have three trees, Tradition, "Liberty" (aka Wisdom) and Honour, it's much easier, design-wise, to get them competitive.