Nothing new there then;
The knowledge and 'advice' that comes from many of these 'experts' is frankly shocking. There are very few real mechanics left today. Most are what I would call fitters. Perhaps that is a little unfair on the few, but it is how servicing works nowdays; and not just servicing, also the way cars are designed and made.
A track rod end with a grease nipple properly serviced will always outlast a sealed for life joint, but... in the real world such care fails to be lavished and the serviceable joints invariably fail first.
The same with modern auto boxes. Far better than the older sort but requiring a better fluid. So they made the 'sealed for life' units knowing that they would outlast a unit requiring attention that didn't get it. But sealed for life is not actually that, it means good for 100,000 miles, after which or even about which it is on borrowed tiime with its fluids shot. It doesn't need an engineer to explain or indeed understand that a fluid change here will extend the life of the gearbox. But then why should some people be interested with extending the life of a time served unit when they can sell you a new car or at the very least sell you a new box and keep there fitters employed doing just that, fitting it.
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