I'd like to see some evidence for your assertion that they've produced nothing concrete.
You talk as if Brexit were easy. We're talking about disentangling an entire country's legislative and economic system from decades of cooperation with other countries, with a very real risk of recession and diplomatic repercussions if it's screwed up. I can't see how they'll do that properly in the two years they have, much less six months.
Hell, it probably took them at least six months to figure out in what areas of government and economics there *might* be ramifications, considering they still had to run the country in the meantime. It's pretty clear no one thought about that ahead of time.