I'm not 100% sure, but I got a guess. I suppose because meet with and meet are slightly different?
To meet someone means to be introduced to that person (for the first time) and meet with simply means to accompany someone (regardless of the degree to which the individuals are acquainted).
It sounds good, but I have to doubt that explanation because my friends use "meet" to mean "see" as in like, "we'll meet when I get back to town" meaning "we'll meet UP (see each other) when I get back to town." Which would kind of imply the other way... Idk.