[trezor]

While I can see your point, my approach is more of a middle way.

I use a up to date standard compliant browsers like Firefox 3.5 when developing sites, but I keep the my CSS restricted to what I expect will be supported in MSIE. If I go overboard with new CSS features, I know I will be creating a much bigger job trying to fix it for older browser (like Firefox 2.0, not just MSIE).

I find that so far that has worked well for me.