I think reality is more complicated than a one size fits all approach. It's going to be specific to your org, your project, the stage it's at etc. To add to that, the right thing to do is often in flux.
Dedicated capacity is necessary, as is embedding. Not always at the same time or in that order. That's where only the information found inside the walls of your organisation can help you decide what is necessary to solve your problem.
I think reality is more complicated than a one size fits all approach. It's going to be specific to your org, your project, the stage it's at etc. To add to that, the right thing to do is often in flux.
Dedicated capacity is necessary, as is embedding. Not always at the same time or in that order. That's where only the information found inside the walls of your organisation can help you decide what is necessary to solve your problem.