If a key has several encryption subkeys, data should be encrypted to all
subkeys. The assumption is that the recipient uses a different subkey on each
device but likes to decrypt mails on any device. OpenKeychain does it this way.
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Why is this a reasonable assumption? This proposal changes the way that GnuPG
has been working for years and will inevitably break someone's setup. It would
be much better for the receiver to use a non-critical notation to indicate the
desired behavior.
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It is a hack in OpenKeychain to allow the use of several devices. Frankly, I am
not sure whether this is really a good idea: The security is limited by the key
for the least secure device.