I agree that difficulty shifts things around a little. I think it's most apparent with the comparison between FIN and ORG.
First, maintenance is slightly more expensive on higher levels, second you are under pressure to prioritise production over economy (there's a much shorter time window for grabbing land peacefully, adequate defense requires more units, wonder races require more focus).
And this is just looking at 'money' traits that are directly comparable. Around Monarch, my budget constrains my expansion so FIN or ORG are very helpful (early on, FIN can mean an additional 25% income... operating close to the limit that can be the difference between total collapse and continuing the land grab while slowly teching something that will get one out of maintenance hell).
At Immortal, beating an AI to decent spots (or boxing them in outright) becomes a larger expansion concern than my finances, meaning IMP and possibly CRE (I greatly dislike the trait myself) become more relevant for adequate expansion.
Industrial is very sensitive to difficulty as well, but it can go in either direction. 'I build all wonders anyway, so it's quite good' can become either 'vital to reliably execute my chosen strategy' or 'useless because wonders aren't worth the bother'.
***
I voted for Financial because of its impact as well as usefulness; it makes cottages desirable early on and in the late game even without a dedicated CE setup.
First, maintenance is slightly more expensive on higher levels, second you are under pressure to prioritise production over economy (there's a much shorter time window for grabbing land peacefully, adequate defense requires more units, wonder races require more focus).
And this is just looking at 'money' traits that are directly comparable. Around Monarch, my budget constrains my expansion so FIN or ORG are very helpful (early on, FIN can mean an additional 25% income... operating close to the limit that can be the difference between total collapse and continuing the land grab while slowly teching something that will get one out of maintenance hell).
At Immortal, beating an AI to decent spots (or boxing them in outright) becomes a larger expansion concern than my finances, meaning IMP and possibly CRE (I greatly dislike the trait myself) become more relevant for adequate expansion.
Industrial is very sensitive to difficulty as well, but it can go in either direction. 'I build all wonders anyway, so it's quite good' can become either 'vital to reliably execute my chosen strategy' or 'useless because wonders aren't worth the bother'.
***
I voted for Financial because of its impact as well as usefulness; it makes cottages desirable early on and in the late game even without a dedicated CE setup.