[annerajb]

What's the most amazing is that Elon mentioned on twitter that it's only using data gathered in the past month since they announced the hardware/first video.

[emcq]

That's a little bit of a misdirection. They certainly learned a lot about how to build their models and what data is important, and this results in more effective training.

[kayoone]

But why wouldn't they use old training data to make it even better ?

[bbarn]

Could be because there'd be assertions made under the old system, that were later found to be unhelpful or unwise?

[IanCal]

A simple one, the old system didn't have 8 cameras so you don't have the full training data you need.