CMV: Any large number meant to be read by humans should have digit group separators (comma, period, space, etc.). Having a number like 38987098 is incredibly confusing for a human to read, whereas 38,987,098 can be read and understood almost immediately.

I understand why some numbers don't need this, primarily numbers that only a computer needs to process. But when it comes to reading, I've seen many instances of large numbers intended to be read by humans not having digit group separators, making the number harder to read the bigger it is. I know that some numbering conventions use these separators at different intervals (like 2 or 4 digits instead of the 3 that I, and I'm sure many others, are used to), but that's not relevant here, or rather, it is because those should still obviously use separators. This is...