In November some users on MacRumors forum reported seeing a bend from the mid-section of the device after normal usage, such as carrying a new iPad in a bag on a weekend trip. The support page talks about the cellular models of the iPad but there have been pictures suggesting Wifi only models are also plagued by a similar issue.
The company goes on to explain that it used a new design that can improve cellular performance, so the vertical bands on the sides now play the role of antennas, just like they do on so many other devices.
The page states that the LTE models were manufactured using a process called co-molding. After the plastic cools, the enclosure is finished with precision CNC machining operation.
In a newly released support note Apple explains how the iPad Pro is made, using a process called "co-molding" where plastic is injected into gaps between the aluminium components.
The support article says that Apple adheres to just 400 micron of flatness tolerances and anything outside of that range will qualify for a warranty fix or replacement. The new iPad's flat edges and antenna line might make slight bends more visible, the report said. These small variances do not affect the strength of the enclosure or the function of the product and will not change over time through normal use. Any bends are apparently caused by the way these new tablets are being built, according to Apple.
See their blog post in full here.
These precision manufacturing techniques and a rigorous inspection process ensure that these new iPad Pro models meet an even tighter specification for flatness than previous generations.
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The article again reiterates that there may be a bend, but that it will be within a 400 micron tolerance.
In terms of features, the 2018 iPad Pros and the 2017 iPad Pros are closer than you might think - they all run the same iOS 12 software, after all, which means you get the same built-in functionality and the same choice of apps across the board (even if everything on a newer iPad Pro might run a little faster than on an older iPad Pro).
It could be, of course, that your bent iPad Pro falls outside of these tolerances.