TL;DR Summary

A former Rockstar technical director has pushed back on the idea that the leaked GTA IV development build proves the game is missing huge amounts of finished content.

The Grand Theft Auto IV development build that surfaced from a £5 car boot sale and was subsequently DMCA'd from the Internet Archive caused quite a stir after Grand Theft Auto fans discovered unused characters, early versions of Liberty City, cut missions, and a zombie mode. It led many to believe that Rockstar could've added so much more to GTA 4 but chose not to, for one reason or another.

Then Obbe Vermeij, the former Rockstar North technical director who worked on Grand Theft Auto III, Grand Theft Auto: Vice City, Grand Theft Auto: San Andreas, and GTA IV, responded on X with a message that amounted to a polite bucket of cold water.

There really isn't a lot of cut content in GTA 4. Just some experiments that were abandoned at various stages or that we didn't have time for to finish. The development of IV was much more 'planned out' than the trilogy before it.