[grammarnazzzi]

That's fine as long as you have balance in your life. Probably healthy as long as most of your time is spent doing something meaningful to you.

But if most of your discretionary time is spent doing unimportant things, that can contribute to depression and anxiety.

"Dial tone mode" sounds a lot like the checking out alcoholics, drug users and other people suffering from compulsive disorders waste their lives doing.

[CobrastanJorji]

I'm no expert, but there's probably a balance. There are certainly some benefits to zoning out for a bit, but there's also an opportunity cost. Spending N hours a week in dial tone mode is likely a good idea, but spending A LOT of time idling is probably not ideal (for whatever your definition of an ideal life is).