I think the voicemail thing is very country specific, I mean here in Poland voicemail is the first thing to disable when you get the phone number, it's even considered rude to have it enabled, it stems from the times when the calls were billed by the minute and carriers seemed to switch to voicemails after too soon, like after 1-2 beeps and "sending signals" (calling without answering to communicate, like "I'll send you a signal when I'll be there" or something) was popular among the young people
On the other hand the answering machines weren't a thing here, maybe it's connected?
Also I don't get the reason behind "but some random business might call me", isn't that an unsolicited call? Of course it's a completely different thing when your number is a business number, but on the other hand why not send an email? Guessing it's a deeply cultural thing stemming from aforementioned answering machines, for me listening through the voice message is inefficient, I prefer text content, like I'd rather read the article than view the video summary, but I know some people prefer it
And here we are in the times of voice messages, my wife uses it to communicate with her friend and I'm tired of hearing those umms, food swallowing, lip smacking etc