As was pointed out elsewhere, we've seen some of the R&D show up in other places already. AR kit has been around for a while. All of the Apple Silicon has bee

As was pointed out elsewhere, we've seen some of the R&D show up in other places already. AR kit has been around for a while. All of the Apple Silicon has been in everything for a few years now (except the new R1 chip, but I'm sure that builds on their M1/M2 work). Face unlocking tech on the iPhone applies to eye tracking (and eye unlocking). Battery tech applies across devices. All the new cameras on the last few years' of iPhones. And so on. So it's totally reasonable that total all in is in the 10s of billions.