Cashiered Captains...
IIRC, one problem with the RN trying to force the Dardanelles was that any Captain who lost his ship in action at that stage of the war faced almost certain 'beaching' following his obligatory court martial...
It was not conducive to 'pressing on' through the coastal forts' fierce fire...
Had the RN trusted the Intelligence reports that the forts were almost out of ammunition and given a 'Nelson' order to 'Press On', much may have differed.
( Later, IIRC, during the North Sea battles, when even Admirals had to shift their flag in a hurry, a modicum of reality crept in. Plus, the 1918 amphibious assault on Zeebrugge *expected* to lose some supporting ships, which were modified accordingly... )
Also, IIRC, when the troops landed at Gallipoli, they initially faced scant opposition. This was fortunate, because they'd been stuck in over-heated, insanitary transports for rather too long. However, by the time the landed forces got themselves sorted out, the Turks had grabbed the high ground, so OTL's debacle ensued...
If the commanders had the wit to send an advance guard to hold the lightly guarded heights, so much might have been different...