If Queen Elizabeth used eight guns and improved machinery to reach 28 knots, she could operate at the same speed as the newer battlecruisers. That would make it harder to justify holding the fast battleships apart from the battlecruiser force. The quoted December 1914 commissioning date precedes Dogger Bank in January 1915. Her participation is explicitly theoretical, rather than an assumed consequence of the design change. With Tiger, she could place a second 15-inch ship in the pursuit.
Notable Point · 1:31:16-1:32:59
Could Queen Elizabeth join the Dogger Bank force?
A hypothetical 28-knot Queen Elizabeth gives a reason to combine the fast battleship and battlecruiser forces.