Sorry if I wasn't clear, I was talking about pets. I'm sure you do fine as a WAR or BLU with access to a variety of weapons, traits like double / triple attack, and job abilities / weapon skills you can use more than once every 45 seconds.
Also, as for the same amount of hate being generated as hate being lost from the reduction, that doesn't seem to be true. Summoners always claimed to be able to lose aggro over the course of a very long fight from their pet (I don't speak from experience, I didn't do the whole solo abbysea thing, just absurd amounts of carbuncle kiting). If that was true, the -70% coupled with defense changes seem to have made it so the amount of time it takes for that to happen is much much lower than it used to be. Who knows really. It would probably take a lot of information about avatar's that simply isn't avaliable online to test, so the best you can do is look at what is happening and guess.