I'm fairly certain that the Corsa also has this indicator issue. But who in their right mind would buy a Corsa eh?
It does - we test drove one on the same day as the Fiesta. Probably both manufacturers think of the short-burst indication facility more as an added "feature" than an issue, but the Corsa was doubly tricky in respect of the indicators because even when they're fully/properly on (rather than for a short burst), the indicator stalk still stays completely horizontal - whilst you knock it up and down to make the setting as normal, it's designed to send the command electronically and immediately recentre, so there's no physical feedback from just glancing at or feeling the position of the stalk. It seems minor, but we found that really offputting, and were very relieved that the Fiesta still leaves the stalk up for right hand indicating and down for left till it self-cancels or is cancelled. Technically we shouldn't need that reassurance when there's a signal light and ticking sound (as in all cars), but it's what we're used to!