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I honestly have never had this issue. It's really about focus and effort. If the person is important enough, I will most likely remember how to contact them. I also mostly use email for all important communications so that remains searchable. The other chat apps are all for casual friends and acquaintances that if lost, well so be it.

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None of my older relatives use email. They can text however (or iMessage, since it is transparent). Not everyone cares so little for friends and acquaintances.

> Not everyone cares so little for friends and acquaintances.

You misunderstand. I have had to use various apps to communicate with people I dont need to talk to again, e.g. hotel and airbnb hosts in different countries which use these services. Like the time I had to install whatsapp in Spain to get into a boutique hotel. Sometimes you are meeting someone, e.g. a potential client who only uses signal so I install signal for our meeting and promptly uninstall it after we are done communicating. I have also had to install signal when coordinating with others for a hackathon and dumped it afterwards as we all had email addresses.

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