Why are you renaming the project?
Through the years, most members of the team have experienced difficulties doing outreach for "postmarketOS" due to the complexity of the name. The name is long and can be very hard to pronounce in many languages. This also has the implication that it gets very hard to remember in those same languages.
The capitalization is also grammatically awkward, with lower-case "p" and "m" but upper-case "OS". We have seen Postmarketos (PostMarketOS?, PostmarketOS?, post-market OS?) written in too many ways, which is confusing to both the reader and the writer.
Finally the name is descriptive. Although that can help people understand what the project is about, it also limits the scope of the project in ways that were out-of-touch with reality long ago, for example when PINE64 sold PinePhones with postmarketOS pre-installed. What was initially an asset, became a liability after all these years. The name being descriptive also means it cannot be trademarked. We believe trademarks can be important, as it allows the project to protect users against fraudulent uses of the name, or users clearly misaligned with the project goals. A trademark for the new name has already been filled.
All in all, "postmarketOS" has served us very well, it brought us to where we are now, and will always be part of our history. At the same time, we believe that to make the project better known outside the hacker community, a rename to a name with less meaning and easier to write, pronounce, and remember would be of benefit of the project.