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To be fair, this isn't even a "subdomain" addressing feature so much as it's just a question of working with multiple addresses period... and in that sense you're right that a lot of e-mail clients don't really handle this as well as they should — particularly when dealing with replies.
I use Apple Mail and iOS Mail, but I also only send messages from a small, fixed number of addresses. Apple's Mail apps handle that case pretty well —*as long as you define all of your "From" addresses as aliases in your Mail settings.
Sadly, this doesn't work if you want to be able to use "on-the-fly" addresses, but as you've pointed out, very few e-mail clients support that, and I can sort of understand why —*subdomain and plus addressing are already something of an edge case, and the need to reply from a subdomain/plus address is even less common.
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