If everyone took your second piece of advice and only used it for discrete transactions, then Bitcoin would be worth exponentially more than it is now, which would invalidate your first piece of advice. The number of bitcoin users is still exceptionally small.
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Bitcoin hasn't been legitimate for a long time. The last boom-bust they went through proved that and nothing has changed since.
If you still have Bitcoins, sell'em and don't buy more, except as an intermediary exchange for your discreet transactions.
If everyone took your second piece of advice and only used it for discrete transactions, then Bitcoin would be worth exponentially more than it is now, which would invalidate your first piece of advice. The number of bitcoin users is still exceptionally small.
Implicit in the advice is the (strong) assumption that not everyone's going to take it.
-_-