Yes... using Leica RF usually will employ 估焦 technique in many situations.. that's also the fun part and actually not difficult at all.
For fast moving kids, after I 估焦... I will move my body and camera with them to ensure the distant between me and my daughter is constant and try to capture the decisive moment of her.
I feel the same about the EVF. Heard that it is a rebranded EVF from Olympus. The resolution isn't as good as Sony, and the refresh rate is low. The thing I really don't like is to manually switch it on and off. Still usable and better than not available when needed for zoom, close up and long lenses.