Having first flown as crew in 1990 I joined then then Britannia Airways at the very tail end of landing drinks. It was being stamped on then and only a few die-hards indulged. At least in the UK. Since returning to flying as crew it is only ever heard of as a throw back to the golden days and in my experienced certainly not practiced.
Landing drinks are not common practice. Full stop.
And the girl has not been charged according to the article so remains an innocent person under suspicion of an offence. Could the problem have been identifed earlier? It may well have been, but the benefit of doubt may have been applied due to operational pressure, until it was clear that the right thing to do was to stop the flight and investigate.