I'm either too nonchalant about driving without the correct hard tags or a lot of people are too funny about the prospect. The truth is probably where you would expect to find it- right in the middle.
I've bought four vehicles on Internet-based deals and have always just brought a hard tag from one of my other vehicles. A more-than-grey area there I suppose but to me the insurance was the larger, common sense concern and which I ALWAYS ensured that I had beforehand. I always drove home in accordance with speed limits and rules of the road and blended in.
Two months ago I bought a Phaeton from a former Michigan State Trooper. I had changed my flights returning from a trip out West and I flew into Lansing, driving it from Lansing to Cincinnati and completing my trip. The trooper told me that I could drive it from the site of purchase to the destination without plates "by the most direct route possible".
He met me at the airport and gave me a bill of sale which he signed and wrote on it the date and time, for the record. I'm not a LEO and someone that is I hope (am sure) will correct me, though the laws may vary from state to state. My guy was a by-the-book fellow and if this were the case he would have balked rather than facilitated.
I hate paper tags because to me they seem like training wheels.