Can you imagine the hassle of getting 30+ cyclists and their bikes off a ferry when they were already on? Just to get one more car on?
They boarded the bikes after the cars for this very reason...
With or without bookings, the vehicles in the queue got on - yes, if the queue was empty and a driver rolled up after the bicycles had boarded, I'm sure that would have been a different matter.
@panyagua "all the cyclists that were waiting got their bikes on... and not all the cars got on."
That wasn't my experience, but yours is more recent, so perhaps they've improved, but as Fimm notes their website still is not promising and you still can't book your bicycle space...
Indeed last summer, the only way I could ensure my family and I traveled on a particular CalMac sailing was to book (and pay for) a car crossing. In the end the sailing wasn't full and I was able to cancel the car for a refund, but it was crazy that I had to strap a car to the bicycles to ensure that plans weren't disrupted!
Robert