Bits of .NET

Gutenberg great for posts but overkill for simple post types. Disable selectively per post type.

Disable for Specific Post Type:

add_filter('use_block_editor_for_post_type', function($use_block_editor, $post_type) {
    // Disable for 'product' post type
    if ($post_type === 'product') {
        return false;
    }
    return $use_block_editor;
}, 10, 2);

Disable for Multiple Post Types:

add_filter('use_block_editor_for_post_type', function($use_block_editor, $post_type) {
    $disabled_post_types = ['product', 'testimonial', 'team_member'];
    
    if (in_array($post_type, $disabled_post_types)) {
        return false;
    }
    
    return $use_block_editor;
}, 10, 2);

Disable Globally (All Post Types):

add_filter('use_block_editor_for_post', '__return_false');

Result: Classic editor for specific post types, Gutenberg for others!