No. We don't need another architect.

Traditionally an architect would design the whole building before giving the plans to the builders. In IT the word also carries a lot of BUFD baggage, an approach I am not interested in unless said architect carries a working crystal ball.

I think an architect is a combination of roles. If the architecture evolves then they can help guide that evolution. They can be a technical lead, tutoring the team and offering advice when things get tough. They can guide the client through the development process and help understand their requirements. They han help recruit new team members.

They cannot go into hibernation and produce an 'In-theory-this-plan-will-solve-all-our-problems-for-evermore' document.