I came across this post from Chris Coyier today, effectively showing how some changes in Safari on iOS 13 have changed some styling behaviour to behave unexpectedly. First, unprefixed styles (i.e., transform vs. -webkit-transform) should not change their behaviour. No developer would ever expect that standard to change without some kind of indication or spec change.
So, I'd echo Chrisʼ final word:
I'd like to raise my hand for un-breaking this. If we don't watchdog for the web, everything will suffer.
Please Safari team, help us out. And, if youʼre listening to random pleas across the Internet, then could you consider opening up a bit more about how you are integrating new/proposed web standards?