Sorry for possibly lame question, but how swap fragmentation can occur o flash based disk? Doesn't hardware controller do "fragmentation" all the time no matter what, due to wear leveling? Especially, when swap is on microSD - I'm not certain if hardware wear leveling occur on eMMC, but SD cards got hardware wear leveling for sure, and as far as i know it is completely transparent for any software controller, IE. filesystem doesn't matter at all.

I would really like to read our specialist explanation on this though, cause it is highly possible that i missed something.