We went through what grandma (grandpa?) needs in the grandma light development thread (link) that started 2 years ago, part of the discussion is repeated here. In practice, any light that works is good enough for most old people and flashlights like that are around already. If it is unreliable, put three of those in the drawer, one will likely work.
My approach was instead not to focus exclusively on what works for eldery people, but also make it desirable for us flashlight enthousiasts (and there are eldery flashlight nuts too, as BLF proves). That is why the magnetic ring came in (every flashoholic loves that), why compactness is required (no flashoholic likes a needless bulky light), why good tint and CRI was chosen, and it must look good too!
For me, a light like that, robust, always works, does not drain when not in use, with easy to use magnetic ring, with USB-C charging, with good tint, and not overly expensive, is as desirable as any cool new cutting edge performer with latest technology. And it works for grandma too.