Why not try small cell? Because I'm not convinced it makes a difference. Every study that I've read on the topic either states that the results are inconclusive, or that small cell has no effect on varroa reproductivity. One study I've read actually states the opposite.
The theories as to why small cell works are nice, but they are just that. Theories. Without proof that it works, I'm not interested in switching just yet. If evidence presents itself that it does work, I'll be interested in switching.
I went foundationless for approximately 5 years. In the end my hives crashed due to varroa (among other things) and I was left with 0 hives. My cell sizes varied, but were larger than they were "supposed" to be. I guess no one told my bees. If foundationless didn't work, I don't have much confidence small cell will work.
Every success story I've heard regarding small cell can not be duplicated. Those that it works for don't even know why, or how, it works. They just blindly go on believing it works when the studies say otherwise. That's fine for them, but don't impose it on me. Similar thought processes worked for the Greeks and their system of gods. Blind faith. I think I'll pass.
But why not use small cell? If you are going to be purchasing foundation, why not have it be small cell? Small cell foundation is harder to find, and usually more expensive. Usually the same with pre-built frames with plastic foundation. So there is a greater cost involved. But even if we can get it for the same price, if it isn't working, why do it? If we don't know if it works or not, why do it? I have one hive that has less mites on it because I let fruit rot on top of the cover. Why not throw rotting fruit on all my covers? Because I'm not convinced it matters.