It's the combination of waranty support and repairablity that is lacking, if both lacking you're on your own and it's even not legal to import in the EU. Topping (and they are not the only one) has both not.
My laptop is Lenovo, also Chinese, also not repairable, but when it breaks down it's supported (a friend had it, and in a week he had a new one within waranty). Then unrepairablity is not an issue from consumer point of view (ecology is another thing, but that is a political discussion we don't do here).
If Topping fix one of those issues, the problem is solved. But untill now, it's grey import with little to no support from the company. That is also why the mainstream is neglecting them and you won't find them in shops down here.