How the Lion class fit Royal Navy operations

Why did the Lion class suit Royal Navy doctrine better than Iowa, and what was Lion meant to do?

Lion was optimized as a long-range, self-supporting fast battleship for British carrier and rapid-reaction operations.

The Lions were intended to replace battlecruisers as fast heavy partners for carriers and rapid-reaction forces. Speed allowed them to keep up with a carrier group or surge ahead when heavy gun power was needed. Stores, maintenance arrangements, and endurance supported operations far from British bases. Their command spaces also reflected growing attention to controlling dispersed task forces, making the design part of an operational system rather than merely a new gun platform.