The right example is poorly executed. The left example is fine, but has one crucial deficiency: it’s not very modular, which makes it difficult to test and scale. Big problems need to be broken down and managed in discrete steps, and this is also true of computer code.
The left example is like running a pizza shop where you explain all the steps to everyone and then let everyone loose at the same time to make a pizza. The right example is like creating stations and delegating specific responsabilities to one person at a time.
The former creates redundancy and is manageable at small scale. But as you grow, you find that the added redundancy is of no additional value, while you end up with chaos, as people argue and fight over the process.
Can you imagine five developers working on the monolithic pizza code all at the same time? Total chaos. Better to have one developper assigned to baking, another assigned to prep, etc.