> One could also argue that Sequoia now knows the difference between a doomed-to-fail grocery delivery services and a successful one after experiencing it first-hand.

When did they experience a successful one?

Groceries are incredibly low-margin businesses that don't engender a lot of interest from the end users (mutual funds for the IPO stock), not usually the purview of VCs. But perhaps this $200M grocery investment will be the $200M grocery investment that pays off.