I follow Mototune method on the brand newones. Prefer to seat the rings better, and yes Jeep indirectly says breif full throttle acceleration within limits of the law and varying RPM constitutes good break in right in the owners manual for break in.
"Brief" full throttle acceleration shouldn't be long enough to create hot spots you would think.
Still Volkswagen (2019 Tiguan OM) says:
A new engine must be carefully broken in during the first 1000 miles (1600 kilometers). During the first few hours of driving, the engine's internal friction is higher than later when all moving parts have been broken in.
Breaking in a new engine
Do not use full throttle.
Don't let the engine speed get above 2/3 of the maximum speed.
Do not tow a trailer.
Speed may gradually be increased to maximum permissible road and engine speed.
Engine life is influenced by how you drive the vehicle for the first 1000 miles (1600 km). Even afterwards, driving at moderate engine speeds, especially when the engine is cold, will tend to reduce engine wear and help the engine to last longer and go farther. But do not drive at an excessively low engine speed, either. Always downshift if the engine is not running smoothly.
I've already done the Jeep-Mototune method discussed above by VNTS, on my '19 Tiguan low-performance car. I hit high RPM briefly
in its first 200 miles. I don't think it will hurt it. After all, the rings should twist in their seats, spending about ~equal time on all parts of the rounded face, where twist amount is governed by load & rpm ranges.
Some engine makers think moly cuts down on those hot areas.