Yeah, let's just hope Huawei doesn't screw up a lot. They haven't so far... well, apart from the Mate XT screen issues but that's not important right now.
So... a tablet?
I am interested in seeing Harmony OS working first hand because the USA monopoly on operating systems with computers, phones, software and especially social media is a disgusting and disgraceful situation.
I can not begin to express my contempt I have for Apple, Microsoft, Google and Meta and want zero to do with any of these convicted in law courts criminal entities.
I am looking forward to the day they are finally conquered and hopefully destroyed as then and only then there will be a dawning of a new and better world and cybersphere. As soon as Harmony OS for PC is available for general distribution I plan on downloading and spinning it up in a virtual machine to check it out.
I'd give it a few years, maybe at least a decade, until it gets close enough to GNU/Linux in terms of software availability. On pc, I see no reason why use that instead of linux.
On phones, that would be an entire separate topic. Still, I'd prefer to see linux on phones projects like postmarketOS or ubuntu touch become more widely adopted, but honestly, I'd prefer to have huawei's OS join in as the third competitor than stay with Google and Apple slowly removing choices and freedom with the excuse of there not being another good enough alternative to escape to.
I don't know what this has to do with an operating system. Though, alternatives for that have been appearing lately with mastodon, lemmy, peertube, etc., which are federated, so not really located in one specific country.
You totally underestimate Chinese ingenuity IMO, a year or 2 at most is all it will take. There are already Harmony OS PC's for sale in China.
I have no interest in switching from Linux, I like Zorin a lot but I am interested in other distros which I've tried a few and at this point in time I happy with Zorin as my daily driver.
To true HOWEVER I have experienced Linux phones first hand, I bought a Pinephone in 2021 it had Mobian installed on it and ... what a nightmare phone it was, it made calls ok, it sent sms ok, it accessed the web via wifi ok, I never managed to get mobile data working and the best part, in less than a year the screen had a big green line down the center of it and was difficult to charge even with the Pinephone cradle charger and maybe 6 more months and the phone was dead, kaput a brick with no hope of recovery, apparently this was all to common with Pinephones so a total waste of money, give Linux phones 10 more years and maybe they might have a chance going mainstream.
All the popular social media are USA owned except TikTok so along with Apple, Microsoft, Meta and Google they are all connected via the USA hence the hatred of TikTok. To get non tech non nerd family and friends to go elsewhere is Mission Impossible even Tom can't get them to switch 
A foldable, all screen laptop, not a tablet.
That seems more specific to pinephone than to linux as an OS in general. I meant it becoming more widely adopted not just by everyone buying a pinephone, but by more manufacturers also selling linux phones. Kinda like if samsung also sold GNU/Linux phones along with Android phones; same hardware, different OS (like what lenovo is doing now by selling their recent handheld pc with steamOS and windows)
I haven't tried any linux phone myself, but from my research, getting an android phone that's listed as officially supported by ubuntu touch and installing it seems to be the most reliable option.
There are a few devices that, according to the supported devices list, should work perfectly, and some are pretty big names, like google pixel, xiaomi or fairphone.
Ah Fairphone, I didn't buy a Fairphone but did by a Gigaset phone with e/OS (now rebranded as Murena) from the e/OS shop, loved
e/OS but after 2 years the battery swelled pushing the back of the phone off however it kept working, then the battery shrunk back to normal size after 3 or 4 months all the while taking a full charge then a few months later completely dead.
My current phone is a Pixel with Graphene which was a nightmare to install, 1. started with Brave on my Zorin laptop and got stuck early in the flashing process 2. switched to and Android phone then got really stuck after the delete OS stage 3. Finally succeeded back on Zorin using this time CLI and some special commands not included in the online tool and much help from 1 or 2 users on the Graphene forum. A WIN for Zorin 
You maybe correct if a major manufacturer took on linux, though don't hold your breath waiting.
The Brax phones from Rob Braxman used to offer Ubuntu however I believe he gave up on it due to to many problems that said his latest actual phone he is manufacturing might be offering Ubuntu as well as his own degoogled OS(?)
Yes it was the actual pinephone that failed, it was total rubbish also Mobian wasn't so good IMO and I had such high hope for it to be totally let down.
看来你非常了解美国，美国的资本主义做的一切都是为了背后的利益集团
我挺关注的，不过我更关注开源版的发展，不过光靠中国自己发展难度太大了