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I'd call that person a one trick pony
A person or group noteworthy for only a single achievement, skill, or characteristic.
Wiktionary
For example, "He may be an excellent mechanicwelder but he's a bit of a one trick pony"
For example, "He may be an excellent mechanic but he's a bit of a one trick pony"
For example, "He may be an excellent welder but he's a one trick pony"
