Haha these oil consumption limits for warranty coverage are rarely arbitrary limits. More often than not, they're set based on complaints and projected warranty costs. Toyota and Subaru dropped their acceptable oil consumption limit in order to avoid warranty work on many of their newer engines (Toyota 2AZ-FE and Subaru EZ36D and 4 cylinder FB engine line). They issue TSB's and Limited-Service Campaigns with very narrow time windows (less than 1 year) for owners to learn about and have their vehicles checked for consumption. If they missed the deadline (less than 1 year) or the car didn't develop the issue before the deadline, they're stuck dealing with the problem on their own.
Who would think it's normal for a company like Toyota to tell customers it's normal for their 2-3 year old Camry to burn anywhere near 1 quart every 1,200 miles? Yet it's a fairly common issue, especially in Toyota vehicles with the 2AZ-FE.
http://www.toyotaproblems.com/trends/excessive-oil-consumption/
https://www.carcomplaints.com/Toyota/Camry/2007/engine/excessive_oil_consumption.shtml
"Subaru considers one quart burned for every 1,000–1,200 miles to be within “normal specifications.” That means if you follow their recommended changing schedule, which is usually 5,000 miles, you’ll probably need to top of your oil reservoir 4 times or so." - http://www.subarucomplaints.com/trends/oil-consumption/
https://www.carcomplaints.com/news/2014/subaru-class-action-lawsuit-excessive-oil-consumption.shtml
"The majority of complaints say that they were told from Honda and dealership mechanics that it was normal for a powertrain to burn a quart of oil every 1,000 miles. The class-action suit claims Honda refused to honor its warranties and instead told people to check their oil every time they stop for gas."
http://www.hondaproblems.com/trends/excessive-oil-consumption/
https://www.carcomplaints.com/Honda/Accord/2013/engine/excessive_oil_consumption.shtml
Ford added the 500 miles per quart limit to the Mustang GT350 supplemental owners manual starting in 2016 in response to the number of 2015 GT350 owners complaining of massive oil consumption. Many had engines blow up because they didn't expect their brand new hand-built 5.2 Voodoo to burn 2 quarts in 1,000 miles. Car and Driver's long term GT350 burned 8.5 quarts of oil over the course of 11,800 miles - most of which were freeway miles according to them.
"Since our last update, the 5.2-liter Voodoo V-8 has developed a thirst for 5W-50 synthetic oil. Over the past 11,800 miles, the high-revving engine has consumed 8.5 quarts. There are no leaks, so we can only assume that it’s exiting the quad tailpipes. If this were the ’80s, this might be acceptable, but it’s 2018 and oil depletion has become a rarity. Ford has released a supplement to the owner’s manual regarding oil consumption, stating that the engine could drink up to one quart every 500 miles under “extended time at high engine speeds, high loads, engine braking, hard cornering maneuvers, and track use.” Our car, however—excepting the odd mountain run and back-road blast, of course—has spent most of its life on freeways."
https://www.caranddriver.com/reviews/2017-ford-mustang-shelby-gt350-long-term-test-update-2-review
I'm just putting this discussion in the right context. 1 quart of oil every 2,000 miles is very low compared to what many manufacturers consider the "normal" level of oil consumption. Most of the GM Gen V V8's don't burn anywhere near 1qt per 2,000 miles. Some oil loss is normal simply due to the fact that modern engine oils have viscosity modifiers that vaporize under normal conditions inside the engine. A typical 0W-20 has some of the highest volatility ratings (NOACK Volatility aka ASTM D5800). The NOACK test heats oil to 250C and measures how much oil by volume is lost due to evaporation. Most 0W20's are in the range of 10-13%. In a Gen V 5.3 or 6.2, I wouldn't be surprised if you lose close to 1/2 quart due to vaporization in the summer, especially if you do any towing or aggressive driving. It's still a very minor amount of oil consumption.