From their own documentation:

opening and re-saving a document renders the same for 307 of the 309 files in the psd-tools test set and 169 of 170 in our mixed ag-psd/psd-tools set

Just what I want in my editing software, the assurance that my saved files will mostly render properly when reopened in the same program...

This is exactly what will sink any attempts to do similar things, it's not the broad functionality of the software, it's all the billions of edge cases.

The LLMs will be able to get all the general requirements mostly right, and that's where it will stop. The subtle errors and bugs will pile up steadily as the codebase grows too large and complex for even frontier models to accurately summarize, and the people who vibed it to begin with don't actually understand what is happening, so they can't troubleshoot effectively.

Automated bug reports will pile up, agents will be dispatched in greater numbers, leading to cost issues and further complicating and compounding the errors in a bloated and convoluted codebase. The leads of the project will get burned out and abandon the project, leaving a giant, rotting, husk behind. Software that was forever, "almost working properly."