WieWaldi My Kawai costs a fraction of her Yamaha CLP745, but the grading is smooth and not in blocks.
After watching her video, I got curious and looked up if DP actions are actually graded in zones. There have been several discussion threads on PW on the topic: here, and here. Looks like Roland PHA-4, PHA-50, Kawai GrandFeel, and possibly GF2 and GF3 are all graded in zones. Some marketing material say "individually weighted keys" which can be misleading. Only when specified as "linearly graded" the keys' weight are individually incremental.
I thought about why acoustic actions make the key harder to press but easier to hold. She was talking about grand piano action. The keys are long, and the entire action mechanism has lots of moving parts. That's a lot of inertia to get moving. However, the key stick is also balanced on the center pivot point, therefore when it's not moving only very little force is needed to keep it in position. In addition, grand action has the real double escapement mechanism which means the hammer weight "escapes" from the key and that lessens the hold pressure, too. DP action, on the other hand, has a lot less parts, therefore smaller inertia. DP action's pivot point is also at the end of the key stick (except for VPC-1's RM3 and NV10s), making the bottom of the key travel needing the highest pressure to hold in place.
I watched all 4 episodes of Daria's talk on Acoustic vs DP. Although she does not come off as being knowledgeable of the DP technical details, she does draw all her points from experience playing both types of instruments extensively. At least that's my impression.
