With the nerfing of Price of Perfection this leaves only two detriments that give more than -10.

Wary Travelers 2

Vexed 2

While still having some bonuses have incredibly huge costs.

Crowded Planets 2

Guardians

Legendary Heros 2

Businessman 3

Constructionist 3

Growth Plan 3

Rational Minds 3

I feel like the 4 resource boosts are pretty balanced.

Crowded Planets, Guardians, and Legendary Heros I feel are very overpriced for their effects vs the cost to get them due to the limitations of high-value detriments and trait count limit.

Guardians can lead up to 100% 30-32 systems before starting giving less approval per planet if you explore all guardian curiosities.
This can be pretty huge, I'm starting to make the first approval building after turn 250 (and the last tecnologies I miss are the 4 Endless ones)

Subjective though it may be, I've said for awhile now that traits need a review, even if it's just for their costs.

The very first thing I saw when I went to the steam workshop just now was a mod that does this. If you're playing with custom factions at all, might as well go all in and bring on the mods, it's gonna be a meme game regardless.

and then you could build very op races? not sure how that is a good thing