I mean, pedantically, you’re correct but you’re missing a very substantive point - we regularly deal with metrics which are rates (or vectors) of change. Velocity is change in distance over time, for example - what Netflix had is a reversal of their growth. They had expected all inputs to yield at positive 2.5 mil. change in members. Instead, the lost 200k members. It is completely sensible to talk about their loss of velocity of growth. Moreover, if you want to be get into technicalities, they lost many more customers than 200k - but they gained enough new customers to net -200k - so why not object to that technically imprecise language too? Why? Because while technically incorrect, it still communicates something useful, just as it does to talk about the lost growth vs. expectations.
For all your points about technical and substantive arguments, I think you have skipped over the crux -
> They had expected all inputs to yield at positive 2.5 mil
The crucial word here is expected. I can model all the things and expect that I’ll get a million dollars next week, but I haven’t lost a million when I inevitably don’t get it the next week.
If you make a prediction of +2.5m new subscriptions, during a pandemic and associated economic flux, and the prediction doesn’t pan out, the only thing that’s happened is that you made a bad prediction.
> If you make a prediction of +2.5m new subscriptions, during a pandemic and associated economic flux, and the prediction doesn’t pan out, the only thing that’s happened is that you made a bad prediction.
I mean, that’s demonstrably false. The world works by individuals taking action based on expected outcomes. That crosses species and pervades every waking moment of life. It is involved in things as simple as walking and as complex as mate selection, migration or habitation choices among thousands of others.
To treat this instance of variance between expected outcomes and reality as somehow different makes little sense.
I think it's still very much relevant within the context of the stock dive though - no-one invests in what you've done, they invest in what they think you're going to do next. So they've disappointed their investors, and their investors have disappointed them right back.
