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Related: Why exactly has every person >60 years old started wandering around in public having loud conversations on speaker phone?
Hearing problems. Easier to listen with both ears.
I don't mean to be rude, and I totally understand if it works better to use a speakerphone (some people have ear issues and can't have things pressing against their ears). But if the issue is a phone is only held against one ear, can't you use headphones or earphones that also transmit sounds to both ears?
I'm guessing they were explaining, not advocating. Most people would agree with you that there's another option. Some people are resistant to that, unfortunately, including people I know.
Luckily for me, I already love my earpods. So, I'll be covered when my hearing starts to go.