The prompts that I use in production are polite.

Looking at it from a statistical perspective: If we imagine text from the public internet being used during pretraining we can imagine, with few exceptions, that polite requests achieve their objective more often than terse or plainly rude requests. This will be severely muted during fine-tuning, but it is still there in the depths.

It's also easier in English to conjugate a command form simply by prefixing "Please" which employs the "imperative mood".

We have moved up a level in abstraction. It used to be punch cards, then assembler, then syntax, now words. They all do the same thing: instruct a machine. Understanding how the models are designed and trained can help us be more effective in that; just like understanding how compilers work can make us better programmers.