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Anime is fucking expensive to produce. Animators on TV anime are getting paid jack shit and working ridiculous hours to work on some show that will break even or maybe make just a little bit of money because of merchandising.
It also doesn't help that the majority western companies that made hand-drawn animation didn't actually do any of the animation in their native country, instead outsourcing to Korea. A practice that Japan has and will continue to do as well in a good number of cases.
It's literally cheaper to produce 2d using puppets than hand drawn frames. Hence, why shows like Teen Titans Go exist, even when the creators know a continuation of the original would be far better.