Personally, I think Glass Air is probably perfectly fine if you're wedded to Sky's eco-system in the same way that people are wedded to Apple or Android or Google for their mobile and TV operating systems.
If you just want a cheap streaming TV running SkyOS and are happy to pay for a monthly sub to it, then Glass Air seems perfectly adequate. Cheap and cheerful, perfect for a bedroom.
A cheap smart TV running a different OS with Freeview, Freesat and/or Freely on board, along with an app store to download your choice of streaming apps, will give you much more flexibility and versatility, particularly should you decide to stop paying for a streaming TV subscription from Sky.
SkyOS is really a harvesting tool as much as it is an operating system. All that data it's gathering about what you watch and who in your household watches it and for how long, all is useful to the individual channels and streaming services Sky has partnered with. If you're happy for Sky to sell all that data then Glass and Glass Air is perfect for you. It's how they determine which new content to promote to you. Viewing data is very useful and makes Sky money.
Yes, other TV operating systems do the same, but to a lesser extent than Sky. The global streaming platform Comcast has created does a lot more than just send out live channel streams and host apps. It's a very sophisticated tool for the streaming TV market.
