Cast iron reliability just don't expect agility!

For the basics, WordPress's every day usability is good. For updating pages, adding and managing content, integrating your CRM - it's intuitive. For doing anything more complex or niche such as managing products or detailed SEO work, it requires plugins which can be prone to breaking or just being unintuitive to use.

WordPress is well suited if your offering, web design and branding are well-established. It is very reliable and fairly straightforward to update websites as your business grows.
It is less appropriate if your business is likely to go through significant changes in branding, positioning, or product catalogue. This will require significant input from a developer who can write the necessary code to update pages as required.