Summed it up perfectly. The big boys tend to apply reactive maintenance whereas the smaller yards (mostly) do proactive maintenance. This is where Swancraft excelled. They would replace things before they failed and their battery systems were second to none. Genuine breakdowns were as rare as hens teeth. Touch wood (fingers crossed) never had a flat battery.
But as Jean says, the yards do need hirers to tell them if there is an issue but I agree, I think the yard should have picked up the battery problem.