It is very feasable to have a completely free PC and for it to be fully functional... It seems a kind of silly thing to state that the lack of 3D acceleration means a lack of stability... Personally my notebook is comprised of all free software. I use it to work, IE; write emails, draft documents, surf the net, create projects, etc. and thats really all it needs. Of course it's stable and it works fine. Also, it isn't just a morality check for someone to create a completely free OS... There truly is a demand for it and if folks start to take notice that can only help the cause of getting 3D acceleration into the FOSS realm.
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