Fair point. Although I've never had any issues with similar rating induction hobs on 32 amp circuits before.The thing is with those type of hobs is that the combined load of all 4 hobs is about 10kW..
When all hobs are switched on the overall load is reduced..
In some instances I would apply diversity; such as the overall maximum demand but not for a single supply to this type of hob if it is known that it will be used at full power for long durations