Re: As well it should
"I would argue that extending a mission while it delivers interesting (and that is the caveat!) science is an extremely efficient use of resources"
What was deemed 'interesting' 100 years ago is only part of what we find 'interesting' now. Even 50 years ago data on atmospheric CO2 levels collected were not front page news, now the record is essential to chart global warming against CO2 concentrations. The stacks of tapes of Voyager data was going to be thrown away, I believe due to lack of storage space, until rescued and used by someone. Mrs Thatcher wanted to destroy the local council records of rateable value for properties to prevent anyone going back, and forcing councils to use the 'Community Charge', despite pretty much every historian saying that it was essential to preserve the records.
The UK's Ordnance Survey used to have a store of photographs of surveyors, theodolites, trig points etc in the field (photos were used to ensure the precise surveyed location was known to the nearest 1/10 of an inch). They were records of every town, village, city, the clothes people wore, haircuts, moustache fashions, cars, vans etc. from the 30's, 40's, 50's up to the days of GPS. Until the OS decided to destroy the lot. I met a person who tried to rescue them, and store a lot in his garage, but the OS was suspicious and just sent the lot into the furnace. All that social history gone because someone in authority thought it was not 'interesting'.
I realise that there is a price to pay for collecting and storing information, but if we can collect such data after all that investment, and the cost of getting it again would be horrendous, I say we collect it, and see what can be done with it later.