Hmmm, I think billets are useful if you havn't got a full length stave.
(I s'pose I should say that I'm thinking mostly of ELBs or bend through the handle primitives in the following rather than the bows with a stiff sculpted handle and an arrow shelf)
I'll fess up and say I havn't actually done the billet thing yet, it's on my to-do-list and I have 2 chunks of Laburnum which might just about splice up into a bow.
I just don't get why on earth you want to mess about splicing unless there was a darned good reason

...eg, no staves, shipping or whatever.
Self evidently the stave is 'more primitive' than a spliced up billet bow.
To me the whole point is teasing a bow out of what you have to hand, if that means splicing fine...but is anyone really suggesting that I should take my Yew staves and chop 'em in half so that they make better bows
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. Someone is havin' a Steffi .*
Del
*(Cockney rhyming slang... Steffi Graf = Laff [laugh])