Do you think that this work that had to be done was business critical? My experience while working at FAANGs is that everyone was working a lot but a sizable number of projects were vanity/promotion/keep-em-distracted projects. People imagine overstaffed companies as full of idle engineers but I've seen instances of very busy overstaffed companies working on the wrong projects (migrating to Go because, using Protobuffs for a simple eCommerce API that does not need it, creating a component library for a small internal tool that will not grow much, building your own chat system, etc).