What non-Apple smartphone were you getting in 2010 that received 4 years of updates? My experience at the time was essentially no updates, or relying on custom ROMs for that sort of thing.
I think it was the Galaxy S4 that I had for 4 years, then the S8 for 3. I don't remember if/when updates stopped. I probably only had the phone I bought in 2010 for 2 years because back then they were still subsidizing new phone purchases at the 2 year mark.