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I remember back in the early 90s I read a review of NeXTSTEP for Intel. The main criticism was that it was too "bloated", mainly because it needed 16Mb of RAM to run well. It's ironic that today it'd be considered extremely light weight, especially compared with it's direct descendant Mac OS X.
Do much larger modern operating systems really offer that much more? It's not like NeXTSTEP was an ultra simple OS without a GUI or networking.