I won't get into how we might trim and present our brisket boxes,but with the folks out there,I have almost been yelled at when helping do boxes for folks that present a straight six slices with the SR on the top and the 1/4 inch fat across the bottom.
They don't have Cert. bbq judges , they just take regular locals and give them a quickie class. Then finals table can be some experienced cooks-kinda like chili cookoffs.
The experienced cooks looked at me like I must be "from N Y City" and I slunk away with my tail between my legs.
There are a couple old time cooks, that this forum references constantly,from out there that use fat layers in their KCBS boxes as well.
I've had a business partner for decades that eats steak/prime rib or fried porkchops twice a day and eats every scrap of his fat and mine.
Thus,if I grill,I don't trim anything from his.
But,back to the question of trimming.
I can close trim a raw 16 lb packer in about an hr.
The same one cooked,because I slow cook and render most of the fat and break down the collagen,I run my gloved hand between the flat and point to separate them,scrape off the soft fat with the back of my knife,turn the point around so the grain runs the same as the flat,lay point on flat,slice with my 12 inch Forschner Granton edge slicer and serve.
I may spend five mins with the fat.
As ,Fishboy up in KCMO says"easy,peasy".