Having read the afticle, I don't think he's advocating a spec series per se.
To quote one paragraph:
'The only real way to completely level out differences between teams is of course for all the cars to be identical but Mansell concedes that is unlikely to happen. "You can't stop people making new inventions and technology going forward," he says. However, he adds, "I think it sometimes can be slowed down." '
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