This happens a lot with anime for some reason but the same thing occurs with soap operas, webcomics now and even some game stories. Like just conclude your story! Give the plot twist and be done! I don't need to see "Oh no our crew is up against the 700'th bad guy DingDong Samurai Man who looks like a squid mixed with a lemur wearing sunglasses because the good designs ran out after the third arc". I know why they don't do it, keeping an existence audience is easier and makes more money than having to bring them from series to series but still wtf

And then there's always armies of fans who are like "what are you talking about, when Gerp went Hyper Power 5 and beat up Bratwurst that was the best arc. And remember when Naco got pregnant and he had to birth a baby? Pinnacle of emotions there"