I think there are some genetically gifted guys who can see a lot of gains like this... I know people who workout once every six months, in a week or two are shredded and can do BTN Push Presses, 225 for reps..and I'm amazed.
But these people on the other hand never really advance or progress well beyond the strength they accumulated playing sports in high school and/or college..and I believe that to be because sometimes they might lack a plan of progression, and no record to look back on and see where they came from, what worked, what didn't, what to try next.
It's certainly not impossible to train on the fly, but it sure makes it harder on yourself IMO.