I'd disagree - tech leads are there to steer the team, not the tech. They are supposed to understand why the product designers and owners are asking for constant change, and work to make that change happen in a way that isn't disruptive. They are a liaison between different groups, to help the devs be part of an aligned effort between groups, by understanding the goals of all groups, helping the others understand the needs of the devs, while helping the devs understand how they can help meet the needs of other teams.

Do that well, and you don't have a "product" team, a "money" team, and a tech team - you just have a team.