he's convinced it's possible to get obsessed with bike training so much so that it detracts from the original reason you ride a bike.
Personally I don't agree with him.

He seems to be saying that training and enjoyment are seperate and to me it's the complete opposite.

I'm not sure how you can be too safe.

Well trained riders know when it's safe to go fast, so don't confuse safety with restraint. Advanced groups teach progress but only appropriate progress i.e. when it's safe.

But everyone is free to do as they choose.

Those who are against it often have reasons - sometimes they are scared to do a test or don't want to listen/change or have a prejudice against people who do.