it's not a problem for the vast majority of people.
the vast majority of people only use X on a local machine and never touch the network
this is especially true for developers.
it's also true that most people have no problem with the bloat of current desktop software because they run on recent machines that are fast and have lots of ram.
in both cases this doesn't mean that there isn't a problem, and that fixing the problem wouldn't improve things for everyone with drastic improvements for some users (possibly drastic enough to open an entire new category of use), bit just means that unless it's pointed out to people and they are encouraged to _try_ the use-cases that have problems they will never notice them.
personally I suspect that the linux desktop bloat had some impact on the weak showing of linux on netbooks. most linux distros and desktop environments really want more resources than a netbook has. Linux can run fine on that sort of hardware (I know, I used much lesser hardware for many years), but the current crop of desktop environments really don't care about resource use.