Why Princess Royal is overshadowed in battlecruiser history

Why is HMS Princess Royal often passed over in discussions of British battlecruisers?

She sits awkwardly between the Lion class and Tiger and never gained the same distinctive flagship identity.

Princess Royal was an in-between ship that survey histories can easily pass over. She resembles a repeat of the Lion design without being a simple duplicate. Tiger then attracts attention as the more distinctive successor. Because Princess Royal also lacked a long period as the uniquely prominent flagship, her operational story is overshadowed by the more recognizable ships on either side of her.