[surement]

> if DST was to go, all countries would have to drop it simultaneously, or else the resulting patchwork would be too much of a pain

There are already countless exceptions to DST and people seem to be doing fine. E.g. in Australia there are two regions in the same time zone where only one has DST, meaning they are out of sync for half the year.

[lazyasciiart]

It's a source of constant complaints, massive costs and is totally bloody stupid, assuming you're talking about the NSW/QLD border.