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Yes, in loads of shops. See trunk based development.

Trunk based development involves creating short lived feature branches, not committing directly to master. At least I haven't seen it done that way.

You’re describing scaled trunk based development

TBD works on main, or “trunk” as described in the spec

Can you list some shops that follow this.... "spec"?

Scaled TBD or TBD?

You are describing scaled trunk-based development, not trunk-based development