Prefetching with <link> harmful

I’ve noticed that Mozilla wants to add prefetch as an attribute value for – and I’ve also noticed that it is even mentioned in the current XHTML 2.0 draft.

Frankly: I cannot understand why. While attribute values, such as up, content, help, alternate and others all define relationships between documents, prefetch doesn’t suggest any such relationship, rather suggests an action the browser should take on it’s own.
This is harmful. This is unneccesary. This is something the browser should take care of. If a browser added functionality for prefetching certain types contained in , fine – but prefetching behavior is something the user should choose, not the author.
Seriously, if I use a pay-per-byte type of connection like GPRS – I’d like to be able to determine on my own which documents to prefetch or not.

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