You stop deciding on feeling alone
Deciding whether to keep or change something in the shop used to depend on "I think it will work," without checking whether there was real proof behind it. After running the four questions a few times, it starts to feel natural to ask for proof from your own shop before moving ahead with an idea. That cuts down how many decisions get made on impression alone, with no check at all.
You lose less time fixing ideas you should've adjusted earlier
A poorly reviewed decision used to get fixed only after it was already in practice, causing rework or a repeated change in a short time. With the four-question review before you apply anything, the weak point in an idea shows up before it becomes routine. That saves the time you'd otherwise spend undoing or adjusting something already in motion.
You keep the decision proof written down, not only in your head
Much of what backed a decision, like pricing, customer history, or the result of an earlier promotion, used to live only in the shop owner's memory. By running the fourth question regularly, that data starts getting written down somewhere fixed. That makes the next decision faster to review, because the proof is already noted instead of needing to be recalled.
You cut routine steps that block the customer's next move
Some routine steps existed only because they had always been done that way, even when they made the next step harder for the customer or the order. With the task of removing one step at a time and watching the effect, the routine keeps losing steps that don't help anyone move forward. That makes the path to the sale more direct, without stripping out everything untested all at once.