Q-FFF Theory also suggested this long ago, for all BHs. even measured for Herbig Haro BHs. (see: HH Hotspots):
Equal mass black holes do not Merge.
see: GWTC-2: AN EXPANDED CATALOG OF GRAVITATIONAL-WAVE DETECTIONS Dated 28 October 2020. Read this summary in PDF format (in English) see also: Equal Sized Rigid String Based New Black Holes do not Merge But, Form Herbig Haro Systems.
