What about lectins, phytates/phytic acid, phytohemagglutinin, gas, etc?

Aquafaba by definition is made from beans that have been heat treated > 100C, and chickpeas have the least amount of lectins and phytates. If you're worried, use canned or home cooked chickpeas and avoid the other beans. There are over 20,000 members in the development group, and it's rare for people to report issues with gas, though some have.