Motion Blur analyzed from existing camera footage is never perfect, one of my favorites for that is RSMB by RE:Vision FX.
Resolve Studio 16.2.8 and Fusion Studio under MacOS Mojave 10.14.6 iMac 2017 Radeon Pro 580 8 GB VRAM and 32 GB RAM 2018 Mac mini 16 GB RAM plus eGFX Breakway Radeon RX 580 (currently my test system for DR 17 beta under Catalina 10.15.7)