Once upon a time people managed without a regular postal service. I have been rereading the Paston papers, the correspondance of a Norfolk merchant family in the 15th century. Letters and communications depended on sending a servant or waiting until someone was going where you wanted.
When Roland Hill introduced the penny post. Lots of people probably grumbled about it and someone who was not literate grumbled about the butcher sending the bill by post and them having to get someone else to read for them, instead of justing coming round and saying how much was owed.
Twenty years ago I can rmember the difficulty of having a client without a telephone. Ringing neighbours, leaving messages etc etc.
Every new technology starts as a luxury and ends as a necessity. Nevertheless it is up to each of us to decide how far we use it.
The OP clearly has a life where modern technology plays a very small part, that is fine. I on the other hand have a life where modern technology plays a reasonable part. Others use it even more
Most people know about the frustrations I have using a mobile phone because I have dyspraxia and ADHD, so, although I do not send text messages if I can avoid it, I use the SatNav, make phone calls, use maps, look things up on google and have a personal phone directory on it.
My computer, which I do feel comfortable using, is on all day. Already today I have had emails from 2 groups I belong to confirming my details n one case and telling me how to pay my subscription in the other. I have had notice of several PMs on GN, my DH has forwarded me an email from our estate agent, a favourite restaurant has sent me this weeks lunch menu.
As well as that all the lists etc I used to do on paper, I now do on spread sheets or word processing documents on my computer, no bits of paper and pens getting lost or crossed. Lots of bits of paper scribbled on, crossed out and rewritten until they are illegible. I have planned next weeks menus, prepared a shopping list, checked my calandar, cancelled a hair appointment. All online.
Each to our own, but there is no special virtue at being at the leading edge or trailing edge of technology. It is there to serve us and if some people do not need it then do not use it, but businesses now will use it and assume its customers use it because the vast majority do.
If anyone choose not to to own the technology that everyone else takes for granted that is fine, but do not grumble because the whole world has not been as unwilling to adopt it as you have and just accept that you are one of the few who do not use it and the world has moved on.