This struggle is going to trigger our brains to engage with us in a way the enforces the status quo. This is because as far as the instinctual parts of our brains are concerned change is equal to danger.
It has no processes or habits in place to engage with the new undertaking without providing immense resources. So it will do what it can to convince you to keep things the way they are.
Each part of the journal has a role to play in helping your brain recognize the change is safe and correct. Your wins are arguably the most important part of this. Because while all the other sections do invaluable things like help you set an endpoint, stay focused, deal with unforeseen challenges, and builds awareness around the work.
If you do all of that but cannot or will not see the benefits you're gaining from pushing through the struggle. You'll be doing very little to convince your instinctual brain that this new change is positive.
Even if you push through without ever recognizing wins. You run the risk of having a significantly negative outlook on the struggle you've gone through and this can easily lead to relapse and a loss of all the progress you've made.
Wins are how you learn to love what you are doing, to find joy in the changes you are making and so find lasting change.