I seriously doubt this. Let me give you a real example for my upcoming trip.
On Thursday, April 9, we have a 5:30 reservation for dinner at BOG. I wanted to make FP reservations to work around that reservation, and made them for 7DMT from 4-5 PM, A&E for 7-8 PM, and Space Mountain for 8-9 PM ( I then changed that one to Wishes).
If paper FP were still in place, I seriously doubt that you could have found FPs for each of these things at those times unless you were very lucky. Based on the experience with things like TSMM during holiday periods, the FPs for both 7DMT and A&E would be going very quickly and you'd have to be there at just the right time to get a FP with a 4-5 PM return. And, 2 hours later, the FPs for A&E would be long gone.
You would also have zero chance of getting these FPs at those times if you didn't spend most of the day at MK. We won't decide until the time comes where we will spend the morning and early afternoon that day. That will depend on what we do on the first few days of our trip. But, I can say with almost absolute certainty that, if we arrived at the MK in the middle of the afternoon on a busy day, the FPs for 7DMT and A&E would be long gone and, if FPs for SM were still available, they might have return times later than 9PM.
And that highlights why a lot of people consider FP+ to be more flexible. Especially at busy times, paper FP just didn't work well if you didn't plan to spend almost all day in one park. If you wanted to take a break from, say 1-4 PM, you wouldn't be around to use FP's that were available late in the morning, or to collect ones to use in the evening. If you wanted to hop to a different park for dinner or a night show, your chances of getting anything useful were even lower.
But, I'm open minded. If you can explain how you would have used paper FP to get FPs for 7DMT, A&E, and Space Mountain at times close to the ones made, I would like to hear it.