I find my standard Cookshacks to be very moist cookers and don't like to foil.
They are efficient so they don't oversmoke-one reason pure stickburners may foil on long cooks.
They don't flow large volumes of air,like some offset style stickburners,which is a cause of drying out.
If I'm cooking several packers, in my larger Cookshack,I'm too lazy to foil them all.

Smokin' taught me to learn to cook on my cooker,and then worry about tricks.
Every brisket is different.
If I am cooking an Excel select, or ungraded cutter,etc. I may adjust.
This could be from an 18 yr old dairy bull,or a wild longhorn.
These should have been ground for burger,or maybe a pot roast.
If so ,I'm looking for color and bark,but by 170ºI'd probably add some liquid.
In my regular Cookshacks,I tend to cook fat up and not on the top,or bottom racks.
As to liquid,some don't believe in any.
"Crutch" users,or vendor/caterers like black coffee,because it was usually around and cheap.
There are recipes for sauces and rubs,where coffee adds a flavor variance,that doesn't really taste like coffee.
If you use liquid,there are no rules.
Broth,coffee,vinegar,olive oil,wooster,bbq sauce,salad dressing,soup,hot sauce,water &rub,seasonall,msg,celery seed,beef base,wine vinegar,balsamic vinegar,liquid margarine,butter,liquid bouquet,soy sauce,teriyaki sauce,multiple blends of fruit juices,etc.