Readers will consider your site to be a reflection of your authority if it looks professional and has a lot of useful information. In contrast, your site should not appear too flashy or distracting. Additionally, if the website looks poorly developed and/or structured and/or out-of-date, the user will make the same assumptions about your business.
Having a good website that highlights your product and/or service will help it stand out.
As websites become more sophisticated, it is sometimes apparent that certain aspects of the website are no longer working well and have become outdated!