The Mocap files are useful to learn and try out the Character definitions and Motion Solver. Rather than import your own to try this out they have given you fast access to some Mocap files. If you go back there was plenty of people including me complaining about retargeting, the wrong joint orientations would mess it up enough to not use it.
Delta Mush has been used in Maya for some time, and when it came to a paid for plugin version for C4D I jumped on it although that plugin was made free eventually the included version for C4D will always be kept up to date working as a native part of C4D. Again storing poses was down to Nitro Pose plugin, now we have a native solution.
Copy and paste interpolations, or Ease curves is time saving and its the smaller things that make the big differences such as the filters for name and position or rotations for the F curves. The short cut keys Shift I or O again speeds things up setting the timeline input and output range. The filters for each object in the object manager is also so very welcome. This really simplifies what we need to see for animation.
Adding markers for BPM for spot on timing, exporting timeline markers for their range into FBX files, Delete keys, Animate only for auto keys all save time and otherwise manual operations. These are all things that may be overlooked but are huge when in production for efficiency and speed.
Dan