in the month of June one ui 2.1 will be released for note 9 and so series. people are talking about apple giving updates for 5 years there are no major changes in updates if you look at ios 9 to 13 compared to andriod.
Samsung offers what we pay for new features are rolled out one ui 2.1,unlike iPhone for 1 lakh you get zero features ios 9 to ios 13 nothing has been changed. I have used all brands but note series is the best I have used so far