It’s for research. They are not obsolete in that sense.
There are real benefits to keep studying these older models. And retrodictively track progress over time in areas undertested. And it’s actually easier and safer to do certain things on them, that you cannot do on newer ones.
It’s for research. They are not obsolete in that sense.
There are real benefits to keep studying these older models. And retrodictively track progress over time in areas undertested. And it’s actually easier and safer to do certain things on them, that you cannot do on newer ones.