For me the Android emulator in conjunction with a fairly large react native dev server and an ide is enough to fill 16gb. I've had to resort to closing the ide before starting the emulator, and waiting for the first build to complete or things get OOM killed. If I run the test suite whilst the emulator is open then there's a good chance something will get killed as well.

This looks like it could be a compelling choice for my next laptop but will have to pass if it's not possible to go to 32gb