imo there are pretty much like only 3 types of protocol governance raison d'être

1. ecosystem development (nouns, optimism, arbitrum)
2. params mgmt (maker, aave, comp, lyra)
3. wish-we-didn't-have-to-have-it-but-we-do (ens, uni, lido)

imo these map pretty cleanly to Vitalik's "reasons why decentralization is important"

ecosystem → credible fairness 
params mgmt → decisions in concave env
wish-we-didn't → censorship resistance

imo these map pretty cleanly to Vitalik's "reasons why decentralization is important"

ecosystem → credible fairness 
params mgmt → decisions in concave env
wish-we-didn't → censorship resistance

https://vitalik.ca/general/2022/09/20/daos.html