I found your article on simple mobile phones disappointing. All the phones you recommended have two main problems for someone like me, at 74, or my 86-year-old aunt, both of us having real problems with phones.
The screens are too small for someone with limited sight to read.
The button alphabet is much harder to use than the QWERTY touch keyboard, and it is much easier to make mistakes when using it. If you have huge fingers or tremors you can use a “pen” which attaches to the headphone hole to make the keyboard easier to access. Most older people, especially females, are used to the QWERTY setout from their employment days.
What is the solution? All I can think of is a hinged phone with the screen on the lid and a touch keyboard – possibly with button keys – on the main body. Like a mini laptop.
Then we could also get rid of all the confusing icons and apps, especially the ones that seem to magically sign you up for things you really don’t want.