Slightly different thing and a different timber used with different qualities. You can press a cleft more and need no knocking in but the bat will be hard and a small middle. I don't think the knocking in machines really do it properly to be honest. One thing in that process is that even if it did prepare the blade the handle will still be stiff as the day it was bound in the workshop. Throw downs are the still the best thing ever if you can get enough of them in my opinion, ( I realise this from the few thousand I used to have to give dean Jones every day of my cricketing life under him as skipper) Baseball bats are taking impact on a smaller area really, round bat round ball ash has a different natural quality to willow, not a flat faced bat round ball with an even harder seam, let alone cricket balls that are coming over filled with nuts and bolts to make the middle and weights right. You may think I'm joking but I've seen some that were tested at Loughborough uni that weren't cheap balls either. There are certain things in life that you can't short cut. We are dealing with natural products that we as humans cannot change their properties so we have to take our time with them. It's tough in this day and age of instant everything, but I truly believe it's something that's worth taking your time with.
I fully understand the value of knocking in a bat. But what i hate is why the customer has to prepare the bat after purchase ( there is a paid service blah blah... understood, but why to do it, paid or not). We dont have to prepare a hockey stick, tennis racket, table tennis racket etc. Why the pressing machine cannot be built such that it eliminates knocking. The press has not changed from the ones we see in old videos from 1950s. This is not a question for you alone, just generally thinking why the pressing process/machines have not evolved. Maybe there is a reason...
Using the bat in nets and getting used to it before batting with it in a game makes complete sense, no questions there...
Opening up of the bat after being used in few games is also a bit questionable. It does ping better, but just a little not a whole lot in my opinion. I think what happens it that after using the bat for a long time, your timing and bat speed reaches optimum level giving a feel that the bat pings better but actually its the batsman who has got used to it.
Just my 2 cents...