I don’t think companies have to support forever but I don’t like the idea of having to rework my integrations every two years.
Also specifying a date is very clunky. I’d rather they use semver (like a non-barbarian) and stick with breaking changes going into a major release.
Consider v3 has been around for a decade, they seems likely to last longer than 2 years.
If they intend to maintain them for 10 years then don’t set a specific timeframe and just stick to whatever their current nebulous language is.
Or how many releases are between 2022-11-28 and 2042-11-28? I’m sure there’s a docs page spelling it out with details, but being able to compare two versions and tell if your code will work is pretty handy.
How much the major version changed (v2 -> v3 vs v3 -> v9) doesn't actually tell you how many changes there were. In that way it's almost identical to using major-version-only semver, vs dates.