"Feature rich" is not a one dimentional variable. One might consider the Plan 9 file system to be very feature rich, i.e. you can do a lot of stuff with it that you can't do with POSIX file systems. But it achieves this in the fine tradition of being composed of very well defined extremely simple components.
I don't think portability is a goal in itself. It is good to achieve whenever possible, but must not reduce systems to their least common denominator. There must also be room for new developments. On the other hand, if you think of pure research systems such as EROS as even better, we probably agree on this point anyway.
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