Where did you find your list of adenovirus vector vaccines?
—-Source please—-
I can’t replicate it.
My post talked generally about generation 2 vaccine types. These include subunit, recombinant, polysaccharide, and conjugate vaccines. Recombinant vaccines, which seem to be the main source of objection here, take DNA or RNA from the target pathogen (e.g. SARS-CoV-2) and insert it into the genome of another, harmless organism (e.g. an adenovirus) such that it’s expressed and can trigger an immune response. More information can be found here: https://www.vaccines.gov/basics/types
Examples of recombinant vaccines which have been in use for decades include Hepatitis B and acellular pertussis (including in the DTaP combination vaccine). For a more complete list, see here: https://www.cdc.gov/vaccines/pubs/pinkbook/downloads/appendices/B/us-vaccines.pdf
This technology has been in use for decades. Successfully and safely.