My take on this is no they don’t. As long as they are truthful they only report on the quality of the product and prevent many people of spending a lot of money from losing it by buying something that doesn’t work.
If your product is shit your company does not deserve to be shielded from the backlash, this is the core of (classic) capitalism after all.
I’m dead set in my belief that this happens to every phone, and I’m sad to see the nothing phone is going the same way.
I had a Motorola X that was suddenly dying in less than 5 hours and one day I couldn’t even connect to my service. I looked and found that an update had uninstalled the phone’s modem. Not even a factory reset helped.
After rooting and finding the correct package for my modem, the phone ran flawlessly using Resurrection Remix (I miss that ROM), proving that the battery and modem were indeed fine.