Roku swiftly followed up its successful IPO, going public at $14 a share with a valuation of $2 billion as of writing, with the launch of a new line of streaming devices and a revamped operating system, looking to further extend its lead ahead of Apple, Amazon and Google in the hardware streaming sector. However, the hardware side of Roku’s business is shrinking, and this seems to have played on the minds of investors because stocks tumbled 27% in the week after the IPO – but this is more of a natural realignment of the inflated stock, rather than major cause for concern. Right on trend, Roku’s new OS 8 talks up enhanced voice commands for users to launch streaming…