I've posed a similar question before. USA WAG has had this semi-centralized system for over twenty years and they never took full advantage of it with having sessions to strengthen gymnasts' weak spots with the coaches who are better suited for a particular weakness.
I think the issue really is the cult of the coach. The national team seems to have pretty good vault coaches, at least. But the kind of coaching that would be needed requires more consistency than a couple of days per month will be able to provide. In an ideal world, the vault coach would do an intensive session with the gymnasts and provide an individualized training plan to the coach to reinforce long term. But if the coach doesn’t ensure that the gymnast actually follows this plan at home, nothing will happen.
And the incentives are really stacked against this. Even if you do not have MAJOR issues to correct, you are likely to spend significant time to rebuild skills. In that time, gymnasts often cannot do the difficulty they could do before, so they basically take themselves out of contention for major teams, especially since even internationally, technique is not penalized as much.
The Leo-biting girl is an extreme example. She had a DTY, but with needing to fix her technique, it took a long time to get back to a FTY only. If your gymnast already is on contention for teams, being consistent with these kinds of corrections does not seem worth it. This is probably even more the case if you believe an elite gymnast‘s window is only a couple of years at the most.
I think the semi-centralized system worked better when the national team coordinator had much more power. Martha was able to dictate a lot to coaches (unfortunately, most of that dictate was terrible). I think we need to hope for coaches to wise up at this point, which does not seem likely…
