Each week Ross Rubin contributes Switched On, a column about consumer technology.
If one takes a narrow view of the tablet market, the largest PC makers have fared especially poorly as a group. At the launch of the iPad, HP, Dell, Acer and Lenovo had little experience with the Android ecosystem, which itself was not optimized for tablets. And Windows, their go-to operating system, was still not available in a version that wou
