I don't want to appear too critical, but you've just outlined the reasons not to persevere with the write-up. The point is that you are right in every respect

I don't want to appear too critical, but you've just outlined the reasons not to persevere with the write-up. The point is that you are right in every respect : except for the part that doing the last 10% is only a modest amount of work. With luck, you've got enough momentum to push through to the end smoothly. Otherwise, you might find yourself within 'just a short distance to the summit' and being someone that climbed 90% of the way up Everest.