Just about any business has customers that either love them or don’t want to spend time looking for an alternative. Those customers will shop on your site whether it’s great or terrible. However, if you want to maximize the site’s usage or grow your business, then you need to keep the site simple and easy to use.
If you are going to get customers to use your new website, then it needs to be easy for them to begin doing so.
A lot of the same principles of simplicity of use in a B2C eCommerce website also apply to a B2B website.