When Apple removed the headphone jack from iPhones, (supposedly) in favor of making them waterproof, that was a design choice that many people rightfully disliked. However, we can imagine there was also a population of people who preferred such a tradeoff. For instance: lifeguards, sea-world trainers, deaf people. It's not a 'flaw' simply because you don't prefer it.
If you are someone who buys a diving watch, but isn't a deep sea diver, you aren't justified in complaining that the watch isn't solar powered. There are people who require (or at least prefer) such a watch, and if you aren't among them, don't buy it.
You don't get to decide what is and isn't a flaw based on your arbitrary use cases. An actual flaw is an implementation detail that is not consistent with the design specs. If Apple set out to make a phone with a working headphone jack, and the resulting product didn't have one, thats a flaw. If they set out to make a phone without a headphone jack, then it isn't a design flaw if the resulting phone doesn't have one.