No one who runs a business can resist the temptation to set some goals around the arbitrary point in time that is the start of the calendar year though, surely?

It’s the most important arbitrary point in time after the end of the financial year.

Remember the point is setting the goals (very visionary) not basing your happiness on whether you achieve them (too harsh). If you want to understand why goal-setting stalls and how to actually follow through, that’s worth a read too.