This has something to do with Qualcomm not providing support beyond that. Now newer pixels use Google's own chips, they will be supported for 5 years. Samsung's

This has something to do with Qualcomm not providing support beyond that. Now newer pixels use Google's own chips, they will be supported for 5 years. Samsung's exynos get 5 years of support as well. But samsung phones using Qualcomm chips will get only 2-3 years of support.