I don’t know. Value engineering has become a hot field in the last fifty years. Ostensibly, the goal is that no componens has excess value beyond the life of the unit. Ideally, an automobile would collapse and fall apart all at one time. It makes sense except that the second step is to decide when that decreptiation is to occur, and that’s planned obsolescence. Most large companies have a value engineering department now. So, if they all do it, they don’t lose.
But this would require collusion for every company to have the same level of planned obsolescence, and while it may happen occasionally, it’s unrealistic to think that this would be widespread. The best strategy here, looking out for a company’s competitive best interest, would be to engineer a product that lasts as long as the consumer needs it for, for a lower price than the competition can charge. This gives you an edge against the competition. I guess you could consider this “planned” obsolescence, but it doesn’t screw the consumer over anyway. We get what we pay for. If you want something that lasts longer you just gotta do some research and probably shell out more money.