Different solutions for different problems. You have a different design requirement when you are designing something for use by the most vulnerable and those without access to reasonable technology. This absolutely needs to be factored in when choosing how to build something, however, this is a tiny subset of users, and this is for essential life-is-in-the-balance types of service.
The vast majority of users will have even a rudimentary smartphone (some years ago I visited the Calais jungle to donate food and supplies, and whilst people were struggling to eat, they knew that a smartphone was a cheap, key thing to obtain and hold onto because they make accessing help and communicating with their support network possible) and or laptop that can handle some lightweight JavaScript and benefit from an enhanced experience.
The vast majority of users will have even a rudimentary smartphone (some years ago I visited the Calais jungle to donate food and supplies, and whilst people were struggling to eat, they knew that a smartphone was a cheap, key thing to obtain and hold onto because they make accessing help and communicating with their support network possible) and or laptop that can handle some lightweight JavaScript and benefit from an enhanced experience.