Firstly, redirects help users to easier find the products they are looking for.
This is crucial if customers use various terms to search for products. For example, they could search for "all in one printer", while the actual product is listed on the website as "multifunctional printer". In this case, the search query will end with a "no results" page, if you don't set up redirects or synonyms
Secondly, with redirects, you can design the customer journey the way you want it to be.
For example, you can choose to display a carefully crafted collection page with brand-related content useful for your customers, educating them or fueling their interest in the brand or the product. These efforts will, in turn, result in a better customer experience
and higher conversion rates.
Thirdly, redirects can improve your SEO metrics. Let's say customers often search for "Nike sneakers" on your website. And you have a collection page with Nike sneakers. In this case, directing traffic to this collection page will boost its behavioral factors, in particular the number of page views.