I didn't know anything about helmets before but i know a lot now. My last helmet was rated for min of 200 G forces (means realistically 250+) motorcycle helmets like i have now are rated for 400+ G forces.
If i had a 400G motorcycle helmet on, would I have still gotten a concussion? Anyone know the answer to that?
Yes, you would probably have still been concussed. Helmets are mostly to protect your skull, hence your doctor's comment about best case being staples in your skull. A concussion happens when your brain sloshes against the inside of your skull too quickly, which would have happened even with a better helmet.
For a helmet to effectively protect against concussion, it would have to be enormous, with a very soft liner, to give plenty of room for your brain to slow down.
This is why you hear of football players being concussed all the time, but never cracking a skull. Tua Tagovailoa (Dolphins QB) was concussed twice from hitting his head on the relatively soft ground.
Your helmet was adequate for the speed you were going and obstacle you hit. It might've been
slightly better with a motorcycle helmet, as they have a nice soft liner between the foam that absorbs a bit more energy.
I've thought about this (you can probably tell) and decided to buy a motorcycle helmet for when I ride my eMoped, as I'll routinely be going faster than 20 mph, up to 33 mph. Also, I won't be working up a sweat. Motorcycle helmets are not ventilated well enough to be comfortable doing ANY work on an eBike. They're even hot going 70 mph on a 90 ° day.
I only spent about $35 on that motorcycle helmet. It is a good quality used HJC from eBay. DOT/Snell certified. It is not as comfortable or well-ventilated as a newer, higher-end helmet, but for my short trips around town, it'll do. You can tell when an on-road motorcycle helmet has been in a crash by the scuffs and scratches. (I would know, as I've smashed two of them!)
What I DO plan to upgrade though is from a regular half bike helmet to one with a chin guard. I was in two motorcycle accidents where having a full face helmet saved me from jaw surgery. (at best)