FWIW, they recently deployed a new filesystem to 1 billion devices with a software update. I'm pretty sure that qualifies them as a competent engineering organization.
Caused problems for almost every software where a patch was needed by the devs (namely docker, sure you could find more examples).
I actually had to reformat my drive because Disk Util.app on a APFS formatted drive could not handle bootcamp correctly on release and it foobared my entire drive.
To their credit they get it right when you give them some months and a userbase of millions of people. I simply wish they did all that before they actually publicly release their latest botch and enable it by default on every device.