[philh]

If SSL isn't supported by the Arduino chipset, then that sounds like more than a "little" reason not to use it. That sounds like it might be an "it would be a whole lot of work" reason not to use it.

(I don't actually know how much work would be involved, but goleksiak says they would really like to use it, so I assume it's not trivial.)

[angersock]

SSL on the Arduino--usually a little 8-bit (!) chip--is a bit resource intensive, in both memory and processing time.