Seems this is a no brainer and should have been the idea from the start ...
In the US, it is very much data-driven. Data is collected from ASAP reports (airline version of ASRS), routine DFDR data downloads, incidents, and accidents. Trends are identified and training, policies, and procedures are modified to mitigate threats.
Automation mis-management was a big threat and training and procedures targeted that for many years to reduce the error rate. Now the data is pointing more toward errors from hand-flying skills and more hand-flying is being encouraged and included in simulator training.
It takes an intentional effort to maintain skills in both highly-automated operations as well as at various levels of de-automation and hand-flying. You can't focus only on one end of the spectrum at the expense of the other end.
Im the only airline pilot I know who has flown entire legs manually (including turning auto throttles off) voluntarily.
Hope you didn't have too many trans-cons!
After departure, you reach a point where you aren't making many turns and are have completed all configuration and speed changes. At that point, there's little value in continuing to hand-fly, IMO. There's more opportunities during the descent and arrival but a busy ATC environment, possibly with some weather, may not always be the best place to turn off the automation. In those situations, the proper use of automation is does a great job of reducing the workload and allowing more attention to be devoted to the bigger picture of the busy environment.
I've seen some posts on night currency recently. The GA-only pilots may be interested to know that under part 121, we don't have to maintain night currency with the three takeoffs and landings at 'night'. We need three takeoffs and landings, but it doesn't matter if they are day or night. Pilots who typically fly at "bunkies" will often have to revisit the simulator every 90 days for landing currency.