Correct "File system cache" config?

[rdn]

Please inspect my current config:

$config['cache']['sessions'] = true;
$config['cache']['enabled'] = true;
$config['cache']['namespace'] = 'xxx_';

$config['cache']['provider'] = 'Filesystem';
$config['cache']['config'] = [
    'directory' => '/home/nginx/domain/public/file_cache'
];

$config['pageCache']['enabled'] = true;
$config['cache']['context']['page']['namespace'] = 'xxxc_';

$config['cache']['context']['page']['provider'] = 'Filesystem';
$config['cache']['context']['page']['config'] = [
    'directory' => '/home/nginx/domain/public/file_cache'
];

Is it:
$config['cache']['namespace'] = 'xxx_';
and
$config['cache']['context']['page']['namespace'] = 'xxxc_';
still needed and relevant?