I would prefer to keep this one exclusive to Faith based classes. I understand your intention since we might get multiple topics parroting the same etc, so information in one place might be helpful. However, I think exclusive topics might be more helpful since there is not much overlap between elemental classes and faith based classes. Faith based classes have almost no identity at the moment and need to be designed from the ground up. Whereas the elemental classes need a redesign.
I would also suggest limiting elemental class discussion to this topic as it is fairly recent:
https://forum.norestforthewicked.com/t/magic-diversity/13972
Again, I understand with wanting to prevent clutter in the forums, but I do think limiting it to two distinct topics: faith & elemental can also work out.
Cheers for asking tho.