Unless you can block illegal unsolicited scam/marketing calls, the medium of phone calls is dead to me. If it had 25% unsolicited calls, it would be a bad way

Unless you can block illegal unsolicited scam/marketing calls, the medium of phone calls is dead to me. If it had 25% unsolicited calls, it would be a bad way to communicate, and in the US it's more like 95%. You could cut the majority of spam calls and I'd still associate phone calls as mostly a waste of time.