The features of DXA are chosen following the rule that we only build that, whichwe know/expect every customer will want/need and cand find a common implementation of.
Stuff which is custom for every other customer, typically does not fall under that rule, neither does stuff that only some customers need and others don't care about that much.
Keep in mind we needed something a rule to determine what to buld/deliver first to make it a valuable acceleration framework. It is simply mpossible to deliver all the functionality that we can think of in a reasonable time.
That all being said, we indeed do not have anything for managing 301 redirect en masse. Partially because we didn't find a common implementation of that and partially because it doesn't really belong to the web application, but more to the application server.
So this leaves you with a very nice opportunity to create a module for DXA that and submit a pull request on our modules repository ;o)