Why don't you go and see for yourself? The testnet is running, the website explains: https://tau.net

Part of doing things right, takes longer. Other blockchains have been hacked for hundreds of millions of dollars, sometimes more than once. I agree, it's taken a long time, but if you didn't have to hold anything during that time, you didn't have to pay the opportunity cost, so you'll get to use it soon. Myself, I'll admit I had to pay the 10 year opportunity cost, but we can't all win.