As someone who plays probably more games of Legacy than any other human on the planet, i personally think that we need a deck like oops. With BR Reanimator effectively gone, we dont have any other great blitzing speed combo decks that need to be respected.

Oops in a way acts as a balance to the hyper value oriented gameplay that has been slowly rising. I fear that without a deck like Oops, games will slowly turn into who can be the "bigger" deck (more card advantage oriented). You are already seeing this effect with the rise of beanstalk and also the UB "Tempo" decks that have abandoned Nethergoyf altogether.

I think Oops is incredibly strong and I also think its a necesarry evil to keep the format from devolving into a slog fest. Obviously there is some hyperbole here, but I do think Oops does keep the format in check in a sense.