1. The proposition that a later Bench has moved
You have a judgment that says exactly what you need. It is from 2011. Somewhere between then and now, a larger Bench may have taken a different view, or the same view for different reasons, or approved it in terms that narrow it. Full-text search will not raise a hand. What you get is a cited-by list, and the work is to open the later judgments one at a time looking for the words overruled, reversed, doubted, referred to a larger Bench. If the list is long, that is an afternoon. If you are filing tomorrow, that afternoon does not exist.
2. The High Court line that may not have survived
Your High Court has taken a consistent view on a question for years. Another High Court has taken the opposite view. Somewhere in between, the Supreme Court has said something that touches the question without deciding it squarely. Working out whether your line survives means reading across courts, in sequence, and holding the whole chronology in your head. Keyword search returns documents; it does not return a position. Assembling that position by hand is slow, and it is the step most easily left half-done under time pressure.
3. The opponent's list of authorities
A written submission arrives with eleven citations. Some are good. One may have been overruled. One may say something quite different from what the paragraph number suggests. Checking all eleven properly means opening each judgment, finding the proposition, and then checking each one's own subsequent history. Under time pressure that check is often partial, with judgment relied on for the rest. That is a rational use of time and it is also exactly where a case gets lost.