In my outfit with no ban on landing for cadets the FOQA data show that the tailstrike risk is highest on the A320 variant. Apparently everyone is extra careful on the A321 (not to mention that it is the easiest to fly and land) and somewhat too relaxed on the A320. However, cadets do receive thorough linetraining on all three variants we use and have to demonstrate of course that they can land them. No limit on crosswind either apart from the official max demonstrated (which is treated as a limit).
Pilots these days with low hours are taught to fly by numbers which this incident shows.
If that is the case with BA and their cadet provider they should change it to a company that conducts meaningful training. If the problem is inhouse training, it might be indicative of problems in their own training department.