A retriever takes a little practice to get used to. There is a fine line of too much pressure and not enough. The reason it took your dad so long is because he hadn't got the feel for it. I agree that the bottles aren't for everyone, but neither are spinners. I've had spinner reels hang up screw up a shot and They are more apt to tangling.I took my stepdad out for his bday. He had never been before. I let him ise my loaner bow which has a ams retriever pro on it. I could shoot reel in, get a fish off, shoot again before he was able to get his line back in and renocked.
Safer? Tie to the back with fast flight and cant guarantee it will break off. Get caught up with a retriever somebody is getting hit with an arrow