My point was mainly focused towards the "those don't run Windows" statement
It depends and is not really a fair comparison to the question at hand... A handheld GPS and cell are already preconfigured to work out of the box regardless what OS is on them and that configuration is there for a specialized task only.... The R&D is already done to make the underlying OS basically transparent to the end user. You could hand either of those to the average Joe and they would be none the wiser.My point was, are they any harder to use than a Linux based one?
A desktop/carputer running Linux however, is not (for the most part). Unless there is the same transparency (one click install for any program, cross-OS, for example), the underlying OS will make itself known.