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Windows 10 is dead? Not quite yet, according to Steam's survey
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I think they supported Windows 7 just until it became too much of a burden to do so. They dropped 7, 8, and 8.1 at the same time, January 1st 2024
the actual 'end of service' dates for win7 (with the max 3 years esu) and 8/8.1 all occurred during the first half of 2023.. so they gave a whole six months of extra life on those versions.
it's very surprising to me that the end of win7 was so close to win10's end lol
One point to consider: using Windows 7 after its end date was popular. Using Windows 8/8.1 after its end date was not.