Git's documentation distinguishes shared repository data from per-worktree state. Worktrees share items such as objects and common references, while each has its own HEAD and index. A normal checkout in one worktree does not switch the checked-out branch in another. Git worktree documentation.
Give concurrent work separate files
Separate worktrees can help contributors avoid overwriting one another's working files. They still need coordination for common branch references, shared services, databases and the point where changes are combined.
Enforce security independently
A different working directory does not restrict operating-system or network access. A tool that can reach other files or credentials may still do so. Use permissions and an appropriate execution boundary for the work being performed.
Review the combined result
Serializing merges may help a team qualify changes together, but a queue does not prove correctness. Run checks appropriate to the changed behavior and retain the evidence for the combined version.
The lesson for a firm evaluating an implementation is to distinguish work organization from access control. Ask which problem each measure solves and what tests show that it works.
Discuss an implementation review.
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