With plenty of light, a camera can choose to use a really fast exposure time, irregardless of the camera are set to 30 or 120 FPS, so you can still get that crisp wide eyed bird just before it hit the windscreen, but with 30 FPS you just can not make a nice slow motion sequence of that, instead in post you can freeze frame on that good frame, let people enjoy that for 5-6 seconds and then back to your video footage.
In the 90ties one night driving home from work,,,,, of course at way over the 110 kmh speed limit on the motorway, i hit a owl ( i assume ) i pulled over and the telescopic antenna on my car had a Wile E. Coyote worthy bend, the bird hit the windscreen in the upper Right corner but did not break anything other than the antenna, but it was a almighty thud.