There's probably a few very widely depended-on libraries in google3 (internal monorepo) that have been in 'maintenance mode' for 10y or more. And pretty major

There's probably a few very widely depended-on libraries in google3 (internal monorepo) that have been in 'maintenance mode' for 10y or more. And pretty major pieces that get replaced with nothing breaking noticeably. A better analogy would be like swapping the engines for electric drive props mid-flight, while other team is replacing most of the wings, but keeping the control surfaces in place. Now, the cargo service would've been killed, and you'd have 3 mostly equivalent screens to choose from to watch movies during your flight.