DotA and Dota 2 are the games that helped define the term MOBA. I'm not sure why you're saying it isn't one, especially since it's in the first sentence of both Wikipedia articles.
Some people dislike the MOBA nomenclature because it comes from Riot (maker of League of Legends; a clone of dota). In addition the term is pretty vague. Call of Duty, Starcraft, and DotA could all technically be “MOBAS”.
ARTS describes it a little better but I don’t think that term is great either.
Managing farming times and item spikes is part of the strategy. Of course it's not a true RTS, but I think that term is a bit better than MOBA; I'm also biased against Riot.