Motion Blur analyzed from existing camera footage is never perfect, one of my favorites for that is RSMB by RE:Vision FX.
Resolve Studio 17 beta and Fusion Studio 17 beta under MacOS Mojave 10.14.6 iMac 2017 Radeon Pro 580 8 GB VRAM, 32 GB RAM 2018 Mac mini 16 GB RAM, eGFX Breakway Radeon RX 580 under Catalina 10.15.7 MacBook Air M1