Canaan was the shit! Try finding fans of Bubblegum Crisis, Noir, Eatman, or Bakumatsu Kikensetsu Irohanihoheto; 90s anime kids don't get together and have rewatch parties lol
You're in for a treat with Bubblegum Crisis. I'd also recommend Nyan Koi, Evangelion (totally not niche but why not), and for a recent anime that has a 90s feel, Megalo Box. I'm a trove of anime suggestions lol
Personally I see it as a selling feature knowing that an anime is only going to be one or two cour. I don't like to watch series that never end so it's nice knowing that the story has a conclusion.
Who said that these anime ends after one season? Many times, they have a cliff hanger ending because the producers were hoping to get a second season or they are a faithful adaptation of the first part of a manga that is only half finished.