The operating system cemetery features has-beens like Windows Phone which tried in vain to take on the Android-dominated smartphone market, while Samsung Tizen has targeted less saturated IoT plays but has struggled to gain traction. How long before Huawei’s HarmonyOS joins them? Late last week the exiled Chinese firm unveiled its in-house, microkernel-based operating system pegged to be “completely different to Android and iOS.” But to the surprise of many, the first product to be given the HarmonyOS treatment wasn’t a smartphone at all, instead rolling out a duo of smart TVs under the mobile giant’s Honor brand – the Honor Vision and Honor Vision Pro TV sets. The two HarmonyOS-powered 55-inch 4K displays will run a Huawei Honghu 818…