[Spex]

Depends on what you mean by "essential", but it certainly would be ideal to show the amount of cuff you mention. If you instructed your tailor to maker the alteration a certain way, then they should fix it at no cost.

I am assuming you wore the appropriate dress shirt to the tailor when you tried the jacket on prior to alteration so they could assess what they needed to do.

I'll add that the sleeves are not the correct length if they are not showing the amount of cuff you want...unless the problem is actually with the length of your shirt sleeves.

 

[Spex]

At 6'2" with a 15.5 - 16 collar size I find it hard to find shirts with a long enough sleeve, short of going custom (which I haven't yet). Therefore most of my shirt sleeves are just long enough to be acceptable, but sub-optimal (as some say here on AAAC). So in my case, in order for a jacket to show some of the shirt sleeve, a jacket sleeve would probably have to be slightly shorter than the average man would wear. However, if I were to alter all my jackets this was and then eventually found shirts with a better sleeve length, the jacket sleeves would probably be too short then.

This may also be part of your problem. If you will always be wearing that length of shirt sleeve, because that's what fits you best, then I do believe you can get the jacket altered relative to your shirt sleeve length, if showing some more cuff is of interest to you.