When I was still using toe clips and straps with cleated shoes I had no problem with foot retention but in order to be most efficient the strap had to be tight enough that it would be uncomfortable on longer rides. Clipless pedals solve that problem and it didn't take long to get used to unclipping when I had to stop, much easier than having to reach down to loosen the buckle on the strap to remove my foot from the pedal. For me, the biggest benefit is foot comfort