Ash For me the point is how intimate people were with their clothes, they have been touching their body and they have gone everywhere and done everything in them, whatever that might be, they are also soft surfaces that absorb things and it gets ingrained in them.
Electronic devices are normally made of hard surfaces and hopefully the only thing that has touched them are hands in most cases. I know that I can disinfect a hard surface like glass or metal and be pretty sure it is actually clean of everything.
Having said all of that, I do buy secondhand clothes and don't have any problem with it, I make sure I wash them before wearing but I don't think about it any more than that. I do not like the idea of secondhand shoes though.