The phrase 'has traditionally been done' is correct and can be used in written English.
You can use the phrase when referring to something that has been routinely done in the past. For example: Cleaning out the gutters before the rainy season has traditionally been done by many homeowners.
All of that has traditionally been done by drug companies, not the government.
Surveillance has traditionally been done by analog, closed-circuit TV systems, which still comprise the bulk of the security market.
The detailed checking of returns is a task that has traditionally been done by large staffs of professional auditors on a sampled basis.
This has traditionally been done by hand, with successive layers of a broad-goods laminate stacked over a tool in the shape of the desired part in such a way as to accommodate the anticipated loads.
Thyroid surgery has traditionally been done on an inpatient basis.
Assessment of halftone flicker has traditionally been done by evaluating difference images [2, 5].
These tasks have traditionally been done by trained city employees, with every agency responsible for trees on its own properties.
Jobs in manufacturing that have traditionally been done by men say steelmaking or shipbuilding have been disappearing, while jobs in services say sales, clerical work or care-giving have been expanding enormously.
One by one, they're integrating easy ways to complete tasks that have traditionally been done over email.
Ultrasound guidance is increasingly being used for neurolytic procedures that have traditionally been done with electrical stimulation (e-stim) guidance alone.
Decades ago the government made a deliberate decision to both privatize and outsource military functions and activities that had traditionally been done in the public sector.
