Why dividends in retirement and not sell stock?

I'm retired and have about 6 years until my state pension kicks in so all my income is now from my dividends and some savings. Between my SIPP and a GIA I generate about £18k pa which covers all my bills and usual discretionary spending. The payments are steady and reliable and require no effort on my part. I can largely ignore the share or unit price as it will only matter when I come to sell which I have no plans to do for a decade or two. I have separate growth pots which I can use for larger capital expenditure or perhaps turning up the income wick in future years at a time that suits me. It works for my circumstances and is robust and flexible, but the idea of swapping my income portfolios for total return and periodic sales, perhaps at a lower value than I paid, does not appeal and I can't see that my situation would be improved by it. Perhaps if I had a comfortable DB pension and my investments were for extra discretionary spending or fun I'd feel different about it but I don't