Please can you explain how a weakened virus, infecting but not overwhelming an immune system, or an adenovirus modified to produce such proteins, or direct inje

Please can you explain how a weakened virus, infecting but not overwhelming an immune system, or an adenovirus modified to produce such proteins, or direct injection of these proteins differ from mRNA vaccines in their ability to leave proteins in a person? I don't understand if you're distinguishing non-COVID vaccines or non-mRNA vaccines when you say other vaccines won't have the issue.