Although I still can't understand his running script and cursive script, I feel that his calligraphy seems to have the artistic conception of painting, which is written with the mentality of painting, so you don't have to find faults in strokes and shelf structure (because he can't find faults in writing regular script), but look at the overall situation of the whole work.
Personally, I'm just a beginner in calligraphy, so I've been away from cursive writing. I'm just talking about it here for reference only.