Someone said it quickly on page 1, but I will re-say it: 4e gave all magical thrown weapons the Returning property as a baseline rule. Which makes sense to me - as a creator, why spend all the time and effort to enchant a durable weapon (i.e. not an arrow) that gets used once? If it doesn't come back, it's not worth it! One thing I did to distinguish between truly designed returning magic, though, is that if it isn't a RETURNING weapon, the return takes time - you can Extra Attack with Dwarven Thrower, but not with Generic Hammer +2, because the second one has to take time to come back. Both an be used again next round, but the DT can be used for every attack this round!
But I do like the Blinkback Belt as a fine solution for convenience of nonmagical thrown weapons (especially since I tend to give players weapons of "special materials" that aren't actually magic and therefore don't benefit from returning enchantments).