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Specifying a big blocksize doesn't mean the transfer will be faster.
send/sendfile won't send more than a certain amount of bytes anyways.
If I'm not mistaken I recall from previous benchmarks that after a certain point (131072 or something) increasing the blocksize results in equal or even worse performances.
Another thing I don't like is that by doing so you implicitly assume that the file is "fstat-eable". I don't know if there are cases where it's not, but the less assumptions we do the better.
Note: I'm sure that for both send() and sendfile() blocksize>=65536 is faster than blocksize=8192 (the current default) so it probably makes sense to change that (I'll file a separate issue).