Given that HIP-5 specifying governance procedures laysout Phase-3 as the consensus phase, that’s a good point, this higher threshold should apply to Phase-3, this looks like the right approach.
Regarding the value of 3/4 threshold vs 2/3, this threshold is based on the historical voter participation in this DAO, acknowledging that protocol level HIPs achieved a wide consensus which would satisfy the 3/4 threshold
HIP-28: Update submissionBaseDeposit 99%
HIP-45: Markdown policy, 100%
HIP-36: Registration Validitity extension 99%
HIP-37: EPNS delegate 99%
HIP-30: PoH Governor Deposit Update 100%
While lots of the politically motivated HIPs were passed or failed with a slim margin which did not signal to me and many POH participants a wide consensus amongst a diversity of pluralistic groups in POH.
HIP-50: Official Social Media Groups 60%
HIP-49: Change of Arbitrator 48%
HIP 48 - Removal of Clement Lesaege 39%
Moreover, the US constitution and other constitutions adopt the 3/4 threshold for UIPs (USA Improvement Proposals). Note amendments to the constitution will also require 3/4 consensus.
I strong believe with conviction that establishing a threshold of 3/4 consensus with encourage more cooperation between parties in the current polarized political environment in POH.
Moreover, I think a constitution encouraging broad and diverse consensus is the only way to avoid a fork.
I do believe that we are stronger together if we cooperate and work together.