It's a new console release(window, I think) title, I don't feel this is an indication of issues throughout it's lifespan. Even if the console's are boasting PC like architecture, there will still be optimization gains over time.
Steven Bogos said:
Josh also said that he was impressed with how similar to a PC environment the Xbox One's dev kit was, and "Happy to not be cross-platform, to be honest - it's a huge challenge for a game like ours."
... "Wow, it's pretty easy to pass our game made and tested on PC to the console! It's a good thing we didn't have to split our resources bringing it to other platforms like the one it worked on before we transferred it to dev kit!"
Snark aside, I can understand not wanting to cover customer support for PC since there can be issues you couldn't have foreseen just based on the users unique environment of hardware and software.
Not that I think that was the biggest draw to exclusivity.
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