Bernie Ecclestone feels this week's problematic Jerez test has validated his opinion that F1 should not have changed power units.
On Tuesday the new V6 turbocharged era began when pre-season testing got underway at the Spanish circuit with all the teams excluding Lotus on hand.
However, Day One was a shambles.
Only six drivers set lap times on a day when just 93 laps were completed by the entire field.
But while some got it right the next day and continued to improve, reigning World Champions Red Bull had a week to forget.
The team managed just 21 laps throughout the four days with engine problems and cooling issues dominating.
The Bulls eventually packed up early when a mechanical issue curtailed Daniel Ricciardo's running on Friday.
"I am disappointed. I hate saying 'I told you so', but I'm disappointed because I did say I told you so and this is what's happened," Ecclestone told Reuters.
"I know Sebastian [Vettel] is disappointed too because he's a racer. He likes to race.
"I am upset because last year's Championship, apart from the obvious that Sebastian ran away with things, was still a very good Championship.
"This year I'm quite sure if we'd have left things as they were would have been an even better one."
Weighing in specifically on the 1.6-litre V6 engines, the F1 supremo reckons there was nothing wrong with its predecessor, the 2.4-litre V8.
"We had an engine that was perfect, everybody liked the sound, it was reliable, didn't cause anybody trouble and was much, much more cheap than what they currently have to use.
"People loved the excitement of the noise we'd got before. And now I think that's all disappeared so I'm disappointed."