It may surprise you that my very high scale employer in addition to having no architects also has no devops. It has instead an infrastructure group that ships a PaaS. Engineers click their own buttons on the PaaS. Only if things have gone very wrong would you end up talking to or having actions taken on your services by the PaaS owners.

Now obviously to design such a PaaS successfully you should know a thing or two about ops, but the outcome of that expertise is a reusable software platform, not per-product (or worse, per-release) labor.