[microtonal]

Signal strength would be better if you hold it in a certain way and this was true for some other phones as well. I had an iPhone 4 and never paid attention to how I held it, and it always worked perfectly fine. Maybe it's because I used a bumper most of the time (like most people, at least here in Europe).

The return rate of the iPhone 4 was much lower than that of the 3GS [1], so apparently it did not affect many users in practice.

It's still bad design, but when I compare it to widespread issues I had with other tech devices relatively minor (e.g. spontaneously resetting Moto X 2013, self-destructing Moto 360 smartwatch back, etc., constant BlueTooth headphone drops on the Nokia 7 or 7.1).

The (by far) worst Apple design issue that affected me and people I know was the butterfly keyboard. It has left me sour for years and I considered to stop using Macs. I am very happy they have finally resolved that now. But many of the butterfly MacBooks were simply defective products. Only the later generations with seals hold up pretty well.

[1] https://en.wikipedia.org/wiki/IPhone_4