Even if you put it all on at once and take it all off at once you are still scaling in and out of cash in your account. If you are averaging in each individual trade is in your definition all in. Ok, let's say it's not 100% of your net worth but only 10% in your trading account and it comes to 100k. So, unless you bet 100k on the first trade you are scaling in. It really doesn't matter if you put one on and take one off or put one on and then put another one on. Each trade is an all in decision on that particular position, but size and distance and time are all scalable.

