For me it's about compatibility and calendar life vs service life. I converted my old MTB ghetto style but it was annoying enough it gave me no extra desire to convert any other bikes. My new MTB came with tubeless rims and so it was easy, and it's in constant service so it's easy to make it part of the routine. My tandem and my old steel roadie aren't compatible AND they tend to sit for a while, don't want to take the effort and don't want cured-up sealant.
__________________
Genesis 49:16-17