People generally misunderstand "no-fault" insurance (not sure if this is what you did here). I believe the primary point of "no-fault" insurance is just that you always deal with your insurance company regardless of the details of the accident. Then your insurance company deals with the other parties insurance company on your behalf.
In accidents you still get assigned a percentage that you're at fault. This influences the amount of your deductible that you pay. More importantly, it also impacts whether your rates can be increased. If you're found to be <25% at fault, your rates won't go up. I think this is in all cases, but maybe this is insurance company specific.
Edit: For a 'fun' read, you can actually see how insurance companies have to determine fault in Ontario: https://www.ontario.ca/laws/regulation/900668
In accidents you still get assigned a percentage that you're at fault. This influences the amount of your deductible that you pay. More importantly, it also impacts whether your rates can be increased. If you're found to be <25% at fault, your rates won't go up. I think this is in all cases, but maybe this is insurance company specific.
Edit: For a 'fun' read, you can actually see how insurance companies have to determine fault in Ontario: https://www.ontario.ca/laws/regulation/900668