Thanks for answering my question! If for some reason I did have an issue with the EVA coming apart would that be covered under the base plate warranty? If you don't mind me asking, why didn't you just fill the whole heel with EVA like the contact pro?
This is my first post, and the first snowboarding forum I've ever signed up to. Hopefully I can answer any questions pertaining to Union. For the record, I am one of the founders of Union and have been snowboarding for 27 years. That just made me feel very old...... I'm not trying to claim, or try to be the authority of all things snowboarding. I just want everybody to know that I'm not some intern working at C3, and know a thing or two about snowboard bindings.
Addressing your question - Yes, they are designed this way for added cushion in the heel area. I think you are over-analyzing it a bit (no offense). Just go ride the bindings, and I assure you won't have any issues with the binding being "too soft" in the heel area.
Travis Rice says that the Atlas is the best binding he's ever ridden. That's the honest truth. If anybody in this forum knows Travis, you know he's a man of his word, and has extremely high standards for gear. Probably 80% of our team rides the Atlas base and none of them have ever had any issues with EVA.
Thanks and happy shredding.