I have do not disturb turned on always, but my contacts are exempt, so for people I know it will ring. If I get a call from a non contact they can leave a voicemail. But most of the time it's a robocall. Not having to deal with my phone ringing all the time has been a big improvement.
Most people leave a voicemail. Thanks to technology, the voice mails get transcribed and I can quickly decide whether I should return the call.
I also see “Spam Likely” for a whole range of numbers. Not sure if it’s Apple or T-mobile but I sure do appreaciate the heads up.