Please let me know where we are not clear on selecting builders or the requirements. The original requirements from Cardano Foundation’s New Delegation Methodology: Supporting the Architects of the Future (October 2021) remain unaffected by these changes. They could be summarized as: we aim to support pools that focus on building infrastructure, setting standards, and developing tools (ideally open source). Additionally, we prioritize those who assist others in a manner that yields a sustainable impact on the Cardano Ecosystem.
For builder tools, this means we look into: who is using it and how, what value it brings, to whom, what problems it solves, frequency of commits, release history, contributors but also basic metrics like stars and forks etc. Technically everything that you would check on any other GitHub project to see if it is healthy.