It depends. In some applications, the business users are SQL power users who live and work in the schema, and every bad design choice hurts them every day. But

It depends. In some applications, the business users are SQL power users who live and work in the schema, and every bad design choice hurts them every day. But in others, the schema is fully hidden behind UIs and canned output (reports, dashboards, ETLs). It never sees sunlight, so many bodies can be buried. Even custom, tailored software often gets deployed as SaaS these days.