The rough part is very poor UX and lots and lots of bugs. I have to give tutorials on how to use my edge when I lend it to people, it's so easy to do weird things by accident and is not obvious what's going on.
No, timezones don’t change but they are swapped out by countries, offsets and timezones are an n:1 mapping. Multiple timezones represent the same offset, but those offsets are immutable.
CEST will always be +2 UTC (unless something really changes politically).
DST just marks that Sweden changes from CEST to CET from October to May. So Swedens offset changes, but the timezone does not change its offset.
That’s wrong or at least not normally how the term “time zone” is used. We would typically say that Sweden is in one time zone whose offset changes twice a year.
Wikipedia calls it "the standard clock time observed during the period of summer daylight-saving in those European countries which observe Central European Time (CET; UTC+01:00) during the other part of the year."
Note the word "zone" does not appear in the above.
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