It is really bad when you can not provide mesa binaries with all features enabled. Of course a fast system can compile full mesa in a couple of minutes but do that on a slow one. Also when you want to show something off a live system with a game that requires float it is more or less impossible (well i know only heaven, but that could change). s3tc can be added within a few seconds - the lib is very small, but for float that does not help. The s3tc lib is basically a joke too - most linux gamers need it and because of a stupid patent it is not default. s3 could really officially allow the binary distribution of it, same for sgi and the float extensions.