The questions may be the same length, but what isn't the same length is the time between the initial asking and the final answer. In the first example the actual question isn't asked for 5 minutes after the initial conversation start, whereas in the second example the whole exchange is over in less than 2 minutes.

You looked at the word count but not the timestamps.

The hello is not the issue. But getting a notification before the question is.

Ultimately what happens if there's a bunch of "helloers" approaching you, you end up muting the messaging app and only check messages every X time. Rather than being available, pros and cons. And there's definitely an argument to be had, that it's the superior way of working - But hello only people, just shoot themselves in their foot and get longer time to response