In my opinion, yes. While twists can add intrigue and excitement to a story, an overabundance can be overwhelming. Consider a story where every few pages there is a new, major twist. The reader may start to feel as if they are on a roller coaster that never stops. They won't have time to process one development before being hit with another. This can lead to a sense of detachment from the characters and the overall narrative arc, as the focus becomes more on the shock value of the twists rather than the story itself.
Well, it depends. On one hand, having a lot of twists can make a story exciting and keep the readers on their toes. However, if there are excessive twists, it may feel forced or contrived. For example, if a mystery story has too many sudden and unexpected turns, it could end up losing its credibility and the readers' investment. The key is to find a balance so that the twists enhance the story rather than detract from it.