Leaving ego's aside, while the reasons for this are obvious to anyone who learned programming with binary and old school stuff like that, there is a whole genre (class) of programmer that has learned what is needed to build web sites and unless you have large scale issues (which you solve by hiring someone with old school CS skills) you can happily be competent and successful without every knowing about how languages implement floating point math. I think it is wrong to belittle these people because I have worked with them and sometimes, I have found, it is their skills that are more often more influential in the success of a product that the CS guy in the back room tweaking the slab allocator. Times have changed. It's no longer crucial for every one who deserves the title 'developer' to know about these kinds of language nuances.
