Misconception: B2B is about selling to businesses and so the end UI/UX is not as important.
In reality, the end user is always a person and there are people that are looking at easy products to use and making the decision to buy from you. The easier your product makes their job, the more inclined they will be to get your products. This applies for products as well as product operations - easy on-boarding, solid customer support and focus on data and reporting as possible.