Building a website with WordPress has several advantages. The same familiar panel is always there when the client already has some experience using WordPress. Learning WordPress also pays off in the future. The WordPress dashboard can be developed with user-friendly menus and configurable settings, so you can add specific functionality to the site when no plugin exists for it yet. And of course WordPress's most important feature: the client can easily make content changes on their own site.
WordPress is an even more powerful tool in the hands of a developer who knows PHP and the WordPress core, because WordPress has a wide range of built-in functions such as "wp_head" (insert content into the HTML head) and also popular plugins like WooCommerce, e.g. "woocommerce_after_add_to_cart_button", which allow adding extra functionality to the online store.
Themes and plugins
Back to plugins. What makes WordPress such a popular content management system (CMS) is its community and the number of plugins developed specifically for WordPress. You could say that building plugins is a market of its own, with companies that focus only on building and maintaining plugins. For almost any type of website need you can find a plugin - free or paid. As developers we can also build our own plugins and add them to the site easily. But as mentioned before, such cases are rather rare, because the WordPress ecosystem already offers so many ready-made plugins for every situation.
Choosing the right theme is also important. Themes define the look and style of a WordPress site. More experienced WordPress developers can tailor the theme to match the company or organisation brand guidelines. That way, when creating new content in the future, the style "foundation" is already in place. Many themes work with WordPress's most popular page builder, Elementor.
Website SEO and speed
WordPress is already built with good SEO (search engine optimisation) in mind. When using WordPress you don't need deep knowledge of how Google or other search engines index your site. WordPress creates suitable URLs by default, and again there are dedicated plugins for even better SEO, such as Yoast SEO, AIO SEO. Site speed also directly affects how the page ranks in Google search, because Google takes page load speed into account. Average site owners can't easily break things when adding content, because WordPress ensures best practices are followed. We often also set up plugins that e.g. optimise image sizes so the site doesn't become slow because of them.
This post only covered some of the main possibilities WordPress offers. At Spetsy we work with WordPress every day - ask us for advice, it's free.