That's how the process works when you decide hiring an agency. You look for the people you want to work with - here Studio 24 - and then trust their judgement, their level of confidence and follow their recommendation.

The agency then reviews the magical three whatever tools according to their comfort level. They are the once that need to get the work done.

It's easier for them to say "No" to the block-editor of early 2020, and simultaneously trust Craft of April 2021. It's easier to deal with a smaller team to adjust the CMS than to deal with one that has to make decision for millions of other users and has an ecosystem of themes and plugins.

We can hope that by April 2021, the new HTMl-block-based templating in Full Site editing will be out of beta. Block patterns, also HTML and block-base are for the content creator to just fill in the blanks of their layouts. They only made it into Core in last version (August 2020), and can use some iteration. Things are in flux with WordPress right now.

At one point Studio 24 needed to pull the trigger and decide on what they are comfortable making the best site for W3C with their current resources. They are after all a for-profit company and have a budget to adhere, too. I don't see this decision as a judgement on WordPress as a whole. It's a decision that WordPress is not the right tool for this project. A decision we make at our agency several times a month, too. Sometimes WordPress isn't the right tool.