I agree with you! Sometimes, in a novel, the author tends to change perspectives a lot of times. Although not all novels are like this, sometimes the story becomes quite a mess and it becomes confusing, especially when there are many characters, and the point of view suddenly changes into someone else's. Some are the opposite; the way they change the characters' point of views is very smooth and not jarring, like the story is very transitioned. Some divide their chapters, and some switch perspectives to hide a certain something in their story, maybe a plot twist, or a problem that will be revealed later on. There are actually many ways to change characters' point of views, but it's still up to the author, of course.
The novel I'm currently working on right now is narrated through first person; through the point of view of my protagonist. I don't plan on changing perspectives throughout the soon-to-be chapters, though. If I ever plan on changing the point of view of a character in my story, I'm thinking that I should just rewrite the whole series but with the other protagonist's perspective (since I'm working on a GL novel). I haven't really thought about these things since I am just a new creator, and my series isn't that popular yet.
And well, if I would be putting an honest opinion here, then yes; smooth storytelling is very important! If the story is messy, the readers might get confused, and they wouldn't be able to catch up with the story. This is one of the most important things in writing or publishing a novel, in my opinion.