it’s easy to customize
I actually feel quite the opposite about WordPress when it comes to customization. It seems quite difficult compared to other CMS’s. Especially when using custom post types or custom fields and adding all that code into functions.php.
With Kirby, which is perfect for many different types of sites, you don’t have to deal with all that bulk file system they’ve got going on. You can add custom post types and fields so easily. (See how to add custom fields below).
client = name of custom field label = name of the label type = text or textarea
Result: 
to output that code, all you have to do is this:
<span>Client:</span>
<?php echo $page->client() ?>
</span>
<span>Art Direction:</span>
<?php echo $page->art_direction() ?>
</span>
which returns this:
