I understand that first-to-file clarifies things once an applicant receives a patent — they don't have to worry about pior art at that point.
However, it seems worse for everybody else: If I publish something new and patentable, but don't file for a patent, it seems like somebody else could then file for a patent on the same concept and I would end up out of luck.
To be clear, I understand first-to-file to mean that a patent can't be challenged on the basis of prior art once it's issued.
What am I missing?