A modern LHD at Gallipoli exposes the technology gap

How useful would a modern LHD have been at Gallipoli or another early twentieth-century amphibious operation?

Overwhelmingly useful in the scenario: modern helicopters, armour, connectors, and naval guns would remove many of the historical operation's central constraints.

This is a technology comparison, not a claim about what actually happened at Gallipoli. A modern LHD could fly troops over fixed positions, land faster craft at several points, provide 76 mm fire, and bring tanks whose mobility and protection would overwhelm First World War defences. A follow-up moves the same thought experiment to D-Day and uses a Tarawa-class ship's infantry lift, helicopters, LCUs, and 5-inch guns. The counterfactual isolates the historical constraints of slow connectors, limited vertical mobility, modest fire support, and the difficulty of moving heavy equipment ashore.