Repeating what? The same outdated, misrepresented arguments mainly relied on by react fandom? It's simple, lot's of options out there. If comfort and loyalty clearly takes precedence over best solutions, you've already made the decision. The problem isn't that web components failed, or you can't pass objects via props, or that you think you need polymer, or their not browser supported, or they actually adapt in most existing Frameworks. The problem is turf, and react loves its turf. Just point out that arguing from a position of 5 year old specs, adoption, and knowledge isn't, IMO, very wise. Rather a self inflicted lost opportunity.