I've always been a little sceptical about the 'modern bats are so much better...' line spoken by so many players and particularly ex player commentators. Lets take what Mike says as true, and assume bats are dried more to get a bigger volume per weight. Now this may be fine for pros for whom bats breaking more often isn't an issue, but is it such a good thing for us normal folk, to whom having to buy bats more regularly is a real problem.
When I get the time and inspiration (could have easily done it today, didn't get round to it) I will make a comparison thread. I have 2 bats of the same weight made by the same person a decade apart. The visual difference is remarkable. I will be attempting to determine as scientifically as possible if any given modern bat is indeed better than it's older counterpart.
There is only one truely 'traditional' bat that I know is still made today, and that is the Mjolnir. Thin edges (by today's standards) and a steep transition from edge to middle. I believe the biggest change in bats and batmaking is the perception of the public who will buy them. Of those of us who were playing ten years ago, can any of us remember being particularly bothered about having huge edges? I certainly can't. Concaving? Never seen, never heard of a decade ago.
Nowadays I reckon bat makers have moved from 'traditional' to 'modern' profiles because they know they are more likely to sell. Everyone wants big edges, everyone wants a bat that has had half a pound of wood scalloped out from the back. But do we really know why?
A bat with big edges for it's weight is attractive because it looks imposing. I suppose it looks 'better' than a traditional equivelent. This could well be due to the same reason we all want bats with clean faces and straight grains. If it looks bigger, or prettier, or generally better, we assume it will perform better. Lets face it, if any of us were offered two bats of identical performance, one pretty, one ugly, we would all choose the pretty one. Even knowing the performance to be the same, we would select for nothing more than looks. Bat makers realise this, which is why it is near impossible to find a non concaved small edged bat in any shop today.
I could rant for hours, and I will, but there is a taster for you.