Interesting -- this likely explains why Tel Aviv has such a high concentration of vegans.
not jewish so commenting outside of my area, but, I think that when the practices were installed, the methods were the 'best available' (and so in line with this thinking), but the problem is that now there is so much tradition bound up with the practice that it's hard to install an alternative practice if one indeed is better (also not up on butchering, so cant comment here either)