I don’t understand the numerous efforts, or appeal, over decades to develop a single product combining driving with flying. Compromises due to conflicting desi

I don’t understand the numerous efforts, or appeal, over decades to develop a single product combining driving with flying. Compromises due to conflicting design and regulatory requirements seem destined to result in The Homer: https://simpsons.fandom.com/wiki/The_Homer https://simpsons.fandom.com/wiki/The_Homer