"Spending time and money to acquire a calendar scheduler shows just how badly they have lost the plot."

It sounds like Clockwise was pretty good at what they did, perhaps even the best in its class. Salesforce presumably sees a need for these advanced scheduling features in it's own products, and they figure they can get them more quickly, more cheaply, and with lower risk by acquiring an already-built technology and team. ie: it's an "acquihire".

But it's not like this is a one off. Salesforce has spent over $10 billion on acquisitions in just the last 6 months!