In my opinion the flextrack issue is a bit of a red herring. The atlas does indeed have more sprint to it that the math or defiantly GG, it is not intended to bend to 0-36 section. I have used it, and in broad curves it is not an issue, the key is to bend and install it at the same time. Trying to bend to a certain radius in the workshop and then place on the layout thinking it will hold its radius is an issue, in order to ensure you don't kink the track, something you can do with other flex track, the atlas has a lot of flex.
The other key point is that Atlas has significant variation of pre made curves, so using flex track is not really required.
