Right, so it is lack of support for cellular bands then and warrenty. I'm quite familiar with Android phones and Asian phones having spent time over there and I've never heard of Aldocube or Teclast. The better Chinese phones that are sold internationally are Xiaomi, Redmi, Realme, Oppo, Vivo. Those brands are just as good as any other brand.
I have a Redmi now, before I had a Pixel 3nand before that I had an iPhone. The most buggy was the Pixel 3, then the Redmi, then the iPhone.
Pixel 3 and Pixel 7 are so different it is not a fair comparison.
Yes I have tried all the major Chinese phone brands as well as some lesser known ones.
Aldocube and Teclast focus on tablets not phones.
The Chinese brands are not as good as any other brand for several reasons at least here in the United States. In markets where those phones are supported then things are a bit different but I am specifically talking about the US or anywhere they are not supported in mainstream retail market.
The first reason is network band support. If the phone doesn't support local bands it is pretty much useless as a phone.
Warranty support is pretty important as things break but it is not just warranty but aftermarket repair support and after sales service which is non existent here.
Then there is the international roms which it is hard to verify if there is anything added to the OS that adds tracking or telemetry in top of Google services. The overall software quality is not always great with bugs and apps that can't be disabled or uninstalled. ROM optimization can also be lacking.
Lastly is updates. I don't know how long these phones will get security or major OS updates. Some of the lesser known brands don't offer any major OS updates. They expect you will just buy a new device.
So for consumers here in the US, Xiaomi and it's sub brands, ZTE, Red Magic, Oppo, Doogie, Umidigi, Ulephone, etc are just not worth the hassle even with really great hardware at very competitive prices. I am not saying that they are bad phones but the lack of various forms of support, warranty and poor updates make them more trouble than they are worth.