There have been many posts here - with some different opinions expressed and defended - concerning the proper sleeve length for a jacket.
If I understand your question and statement - I would consider the point you described as being the proper length for the resting point of the buttoned tight shirt cuff, perhaps an eithth inch longer or so. So that I would want the jacket sleeve to be a bit shorter allowing the "linen" to show. Generally, go for a jacket sleeve length that hits just on the upper (elbow) side of the wrist bone. However, a very excellent way to perform the exercise is to go to the fitting wearing a shirt that has the proper tight cuff fit - so that it stops just slightly beyond that wrist hinge point. Adjust the jacket sleeve again and again, until it is just right to show the amount of cuff you have decided upon - I like 1/2" for myself, others choose more or less. Once you have that length perfectly determined, measure from the tip of the thumb to that jacket sleeve end point. And then make sure that the tailor uses that same measurement each time - and that they measure and mark both arms from the thumb - not the shoulder.