smartphones are all but the norm anymore
Then it appears you disagree with some other Slashdot users who have told me that smartphones are a luxury, not a necessity. The only necessity is an $80/year dumbphone in case of urgencies, and that's only because payphones are being removed. But I'm willing to consider your arguments as to why a smartphone is a necessity.
There was no usage of the words necessity or luxury in the post you were replying to. Something being "the norm" or not isn't related to whether or not it is deemed a necessity.