>>9
Really nothing. Any of us could just crack in and get something made with no preparation, and it might even get finished.
The trouble comes from trying to meet your own standards of quality while working within your skill level and time budget. It’s easy to say "what it's missing is voice acting" or "the plot should contain an allegory for the assassination of Archduke Franz Ferdinand" but every scope increase is a footgun for any kind of creative work. I think this was the downfall of the revival project linked in the OP. Maybe the people behind it hadn't done anything like it before. Again, I like to think my experience lends me some wisdom in that regard, but I can't launch into it just yet.