I think this is a good move in my opinion, they have open the floodgates for others to test it because going full live. At least this is sort of like testing it extremely thorough and careful way instead of releasing it then hackers breaking it and stealing money in the end.
I just hope that hackers won't hide any critical exploit or bug they found out and take advantage of it to steal funds from the users when ETH 2.0 runs.
This is the one that I'm afraid for. Maybe they can see some critical flaw in the code, but won't call it until they release it and then they ruin it for ETH when they hack and take advantage and steal users funds in the millions of dollars.
I do hope that there will be some independent third party to look at the bugs being reported as this might be one way for hackers to mislead and reported it. But in the end, they are not going to report those critical bugs and will want for the right timing to exploit it.