Lots of people, including some experienced cat lovers, don't think about cat's environmental needs.
For decades, our focus was on animal's physical needs - food, shelter, safety, etc.
While the sentiment is lovely, that's just simply not enough.
Over the past decade, there has been lots of groundbreaking researches showing us that animals not only have physical needs, but just like us, they also have emotional needs.
Cats are natural predators, and preys at the same time. They instinctively have certain environmental needs for them to feel safe.
Most of the behavioural "problems" are not really a problem but cats exhibit anxiety. By fulfilling their environmental needs, not only it will improve their mental health, but also, as a result, physical health.
You and your cat will live a happier healthier life.