At creation time, why are shortcut titles translated, but menu link titles are not?

Question

The idiom that the community points to for creating menu links usually looks like this (from \Drupal\Tests\language\Functional\LanguageSwitchingTest::testLanguageSessionSwitchLinks()):

// Add a link to the homepage.
$link = MenuLinkContent::create([
  'title' => 'Home',
  'menu_name' => 'main',
  'bundle' => 'menu_link_content',
  'link' => [['uri' => 'entity:user/2']],
]);
$link->save();

Note that the title is not run through t().

But, yet, the idiom for shortcut links (from standard_install()) is:

// Populate the default shortcut set.
$shortcut = Shortcut::create([
  'shortcut_set' => 'default',
  'title' => t('Add content'),
  'weight' => -20,
  'link' => ['uri' => 'internal:/node/add'],
]);
$shortcut->save();

Note that the title is run through t().

Why are shortcut titles run through translation at creation time, but menu link titles are not? Aren't shortcuts a type of menu link? Shouldn't they be handled the same way?