I'm not really bothered by the changes. it it just that having to find them all is bothersome. And I hadn't have this issue with FFH : I spent hours studying the civilopedia learning things and then I played and read xienwolfs' manual when I came back from a long year and found things had changed.
from BTS to FFh: everything was new save :

and having cities and units so everything was a discovery, I never had the nagging feeling of "I know it should work like that...oops, doesn't".
You seem to think you changed as much from FFH than FFH did from BTS. I think not.
Maybe you are using 50% of FFH, remodeling 50% of it + adding some of your own.
In the end, it is difficult for me to find what are those 50%...
You were asking why I don't play Orbis. I told you. "Too difficult to learn the ropes and see what is different"... Then you answer like it's my fault "It was the same when learning FFH". Well If I thought that I wouldn't have told this kind of answer.
When going from FFH, RiFE or WM toward Orbis, it really seems the same game, same civ, same lore, mostly same units, mostly same promotions, same spells... and in fact it works very differently and is played differently. And there are mostly no guidlines. It is much more difficult to adapt.
RiFE, WM, even Magister'sModmod are less different from FFH than Orbis, true. But on the otherhand, I always could find the main differences between FFH and those mods somewhere on their forum. (I'm not speaking of the changelogs) I don't know why it seems so but I could find the answer somewhere.
Maybe it should only be in the forums or something :
a threads with the main changes would really really be helpful (the one already in place is more an appetiser than somthing you can learn from).
e.g. : each civilization change (not the

but the strategy, reasonning, main special units and/or main mechanisms),
global changes (guilds : what the do, how)
archery ?
religions ?
spying ? (not everybody played BTS. I only played vanilla then FFH)
is commerce different?
new civics ? are they linked with other things : religion/guild/improvement...Etc