It's actually neither. Its the software leadership. Ideally the product people should know what they want and provide that in writing, because that is what they are getting (whether or not it's what they really want). The developers/engineers are responsible for building according to the requirements and constraints provided.
Somebody has to own that. Ownership is important because that's where risk and failure live, and somebody ultimately must make the adult decisions that drives the product forward. Software leadership own the process definitions and risk acceptance while project managers own the budget and process operations.
In software this is often tiny, so its easy to gloss over and get sloppy. Consider freeway construction though which deals with a project budget that can exceed $5-20 billion, physical inventory, hundreds of people on site providing labor, and much more. There is still engineering, product delivery, a customer, and such but the liability is greater, so the planning and ownership are more disciplined. The incentives are also greater. As a result planning and modeling become more important. Injuries and defects cost money and result in halted work, so you have to account for risks and personnel in your planning. When there is no liability and limited incentives people have no real motivation to take ownership.
Other industries solve for this with some combination of licensing and broker/agent model. Licensing solves two problems. First, it sets the minimally acceptable baseline to practice and second it defines a set of ethics that become more important than employer directives.
Somebody has to own that. Ownership is important because that's where risk and failure live, and somebody ultimately must make the adult decisions that drives the product forward. Software leadership own the process definitions and risk acceptance while project managers own the budget and process operations.
In software this is often tiny, so its easy to gloss over and get sloppy. Consider freeway construction though which deals with a project budget that can exceed $5-20 billion, physical inventory, hundreds of people on site providing labor, and much more. There is still engineering, product delivery, a customer, and such but the liability is greater, so the planning and ownership are more disciplined. The incentives are also greater. As a result planning and modeling become more important. Injuries and defects cost money and result in halted work, so you have to account for risks and personnel in your planning. When there is no liability and limited incentives people have no real motivation to take ownership.
Other industries solve for this with some combination of licensing and broker/agent model. Licensing solves two problems. First, it sets the minimally acceptable baseline to practice and second it defines a set of ethics that become more important than employer directives.