Ivan is great! He is one of the few allowed to gently touch the core :)
Remember: in Magento 2 "untested code is incomplete code"
Daniel is a great Magento community contributor and his presentation and extension deserves five stars!
Not only a good presentation but a good contribution to a common problem; well done!
I loved Kemberely's approach and I have the same opinion about agile: use what works for you!