Alternatively, ITT: people who have been through the design-to-dev handoff process and understand the comparative advantages of both teams.

Tools like this can be good for indie developers, the ones who in the past may have had to learn a bit of dev/design to release something. The division of labour is larger teams is different. The product manager may have a user research background instead of a software one. The designer may be good with semi-complete prototypes in Framer, but the responsibility for delivering production code may still rest with the dev team.