With the top three teams winning GPs so far, would you say F1 has reached the so-called 'engine convergence', and is it wrong to introduce a brand new engine given one manufacturer will tend to get the upper hand?
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Any time that the regulations change with either the engine or chassis, there is an opportunity to get it right or get it wrong. Everyone follows the path of best returns from their research, but sometimes you can go down the wrong path - just as Renault did in 2014 and Honda did in '15.
Recovering from that poor choice of direction is both time consuming and very expensive. It's not really anyone's fault, it's just that somewhere along the line someone made the wrong decision.