Conrad, everything is capable when done right. IMO it's a case of what someone wants to experiment with and what suits people for a variety of reasons. When I see cotton builds in Gennies the thought I always have is 'Yup, that looks great, but why would you give up SS mesh for cotton on that atty?'.
Now, you can put SS mesh in any atty too. I've seen that done and that's cool too. It's all about what you prefer and how you look at things. You like cotton in Gennies. I prefer to not have to change the wick in my Genny so often and appreciate the clean taste of SS in that atty. I also like Ekowool in my Kayfun. Still experimenting with cotton in the Aqua. That one may stay cotton because I think it would be hard to dry burn silica in it.
To each their own. Vape on