Their system evolved with it and ours didn't. Their pilots learned to fly in it, ours did not. If you want their system you need to reproduce it, training and all. You can't simply ask pilots to read some literature and say they're good to go.
The safety of the end state says very little about the safety of the interim stages - that needs to be addressed properly and thoroughly, not rushed through to meet an agenda as happened 15 years ago.