While WordPress started as blogging software, they have grown much bigger than that. What is the best use case for WordPress now ? A company website, a portfolio. a magazine ? How would you like to use it ?
If not blog, WordPress is widely used for magazines / news websites. A lot of companies chose to build their website on WordPress. I have personally helped a few of them to do that.
In the end, considering what WordPress ecosystem can offer, you can even build a hospital website using WordPress. Your imagination is the only limit.
Whilst your imagination and remit is the only real limit with WordPress, it's important to remember that with plugins, your are expanding the core. Based on this, it's perfectly feasible to have a fully hardened WordPress installation significantly weakened by a poorly coded plugin that interacts with the core.
Such classic examples are XSS, user enumeration, and remote code execution. The increase in boxing parts also increases the exposure to risk. Do your due diligence.