Earlier quoted context omitted.
No they are not. One is intentionally, secretly, and illegally introducing flaws to defraud an employer. The other is managing tradeoffs based on technical constraints.
I don't think that planned obsolescence is unintentional. If it's not completely secret , it's not admitted to either, and it's not illegal because it's not illegal. Is it particularly that you think that there isn't a continuum from legal actions to illegal actions? Isn't it possible and common that two instances of similar actions can be on the right and wrong sides of the law?
No, your assertion is quite wrong. All engineered products have service lives, because they all have failure modes that are taken into account in the design process. If a phone's failure mode consists of the battery dying the the battery will be designed to ensure it will likely work well for a minimum of x time following a typical usage pattern. Likewise an airplane failure mode is the fuseage breaking off due to fatigue, thus it is designed to be flown X times (takeoff/landing counts, number of hours in flight) taking onto account the likelihood of cracks forming and propagating. Targeting a certain service life in a design does not mean there is mischief in play. It only means engineering.
Thus obviously planting time bombs has absolutely nothing to do with engineering a product.