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I wouldn't put too much reliance on the 'knowledge' of the person you quoted.In the very early days I remember a chap, whose opinion should be respected, saying how virii have been historically known to develop. He made it all sound so simple because he really did know his subject.
In layman's terms, he explained how the virus HAS to mutate & he explained the 2x ways it could go. It could either mutate into something incredibly deadly, or it could mutate into something relatively harmless.
The virus does not 'have to' mutate. It does so because the 'reproduction process' is flawed. It's purely accidental that it mutates. It's because it is so bad at reproducing its RNA.
So mutation is totally random and accidental, but reliable, only in that it will occur.
Sometimes that mutation makes no noticeable difference to any effects. Sometimes a more deadly virus is the result, but because it is more deadly, it kills its hosts, and does not propagate itself. Sometimes it's less deadly, but more transmissible, which means the virus spreads wider, quicker, sooner even via different ways, or bypasses protections. It's not possible to predict how it will mutate.
One thing that can be relied on is: the more cases there are, the greater the chance of more (unpredictable) mutations.