I recommend going with LX FICON cards on IBM Z systems. There are technical vs. financial trade-offs that come into play and I’m not going to debate the issue in my personal blog. But, as I say, my preference and recommendation is to go with longwave.
I understand the financial argument. I also understand the technical considerations, the value of not making self-limiting moves, and the longer-term benefits of positioning yourself to better align with certain statements of direction. I respect those who have a different opinion; I’m just looking at the problem in a different way. I encourage my clients to go with LX, which most of them already do.