Sadly at the moment yes. The plan is to improve it and at the moment its better to use remesh. A value of 0.02 will be okay. Then go lower for more details. At the beginning you lose a bit of detail though its not optimal for realistic stuff more for stylized… Maybe someone else can give here more tips but that is my current workflow.
The problem with that is for example the fingers ( And that one side nail at the foot) of the dino will fuse together. So maybe stretch them a big more apart or do them later…
To spread them apart you can use the pose brush and under advanced activate Topology option.
And for the armature modifier that could be a bug since it says it not supported in dyntopo and should automatically deactivate itself…