I think it'll get better as Foldables become more common. Samsung have clearly made it a focus to fix slow updates and they've done a lot better in the past couple of years.
I haven't really looked in the past year, but I know with Android 9 they were still at about 9 months to a year to upgrade phones on US carriers. So if we get 11 at the end of February then yeah they are improving, but 5 months is still too long IMO, that's still a year from developer previews.
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