If I see a very well flown raw data, manual thrust approach in the Airbus, first thing I ask is: "Ex 737"?
The answer is usually: "Yes".
If not then ex-mil.
I've seen ex-mil, ex-737, ex-fast jet ( spatial disorientation ), bungle raw data flying and fall into a shell of fear of handling an Airbus manually. It's simple on an Airbus though poorly explained and trained. A brief on presentation and errors, a two step demonstration process, leads to a slow build up where a cadet can build competency quickly. It's not to be unexpected that some experienced pilots may struggle with raw data flying if they've never been trained!
This is another example of a latent race to the bottom. We willingly let our skill set deteriorate to make us easily replaced. No visual flying competency, no raw data competency, no circling over at Kitty City......
I'd be paid a lot more if I was required to demonstrate the airline flying skills expected 20 years ago on Airbus.