

The issue is more with embedded systems which have been hard coded to European DST.
Most sane software will use the OS timezone and not care about DST. Most sane embedded systems will have some config for DST. I bet there are lots of cranky unsupported things which are horribly broken though.
I’m pretty sure that eliminating DEI is against EU law, so I’m not sure how they are supposed to conform (and, of course, they shouldn’t). Maybe sue the US government for breach of contract and move on.