The way I think about it is, series with mangas early on are more of an advertisement for the manga and the animation studio are likely to not give a shit, but series that wait longer are more likely to have faithful adaptations of the manga instead of a quick 1 cour shitfest. I have no evidence to back this up though, so feel free to ignore this until I look stuff up after I get home from school.
Also wtf, is my dream of reading HxH and OP on the same day every week just that, a dream? I hope OP doesn't go bi-weekly. I dont want this to finish in 10-20 years.