That must be a very restrictive definition of “successful consumer hardware company”.
I don’t think it’s reasonable to restrict “successful” to iPhone-level unit sales and Apple profit margins.
But Dell’s profits cratered so bad that they took the company private and profits are still nothingburgers.
Sony just sold off controlling interest of its TV division.
https://timesofindia.indiatimes.com/technology/tech-news/son...
Have you checked the profits of the other PC sellers?
A quick Google search shows that LG profits were $2.4 billion dollar (converted) and down its last fiscal year.