This thread is more evidence how /vp is absolutely clueless about competitive.
If you think magic bounce counters all hazards you are a retard. Xatu/Espeon cant stand in front of half of the stealth rockers in OU, if you only rely in magic Bounce to prevent rocks, you are fucked. Similar for rapid spin. It is not a perfect counter, it does the job, but even with rapid spinners sneaky pebbles are still something you have to deal with.
If OP's info is true, this is a huge development, since, IIRC a lot of shit learns defog.