I like this feature too. Somewhat unrelated, I saw a similar "hold-for-me" frill released on my Pixel recently and used it a few times. Later read that ToS and saw that Google records the entirety of your conversation- not just the part that you have them hold- when you use this feature. Wouldn't be surprised if there were something like this on the screen-feature for the calls you end up picking up. For me it's been about 2/200.