It isn't. Don't fall for BMW's marketing, count how many "Coopers" you see versus Mini "Ones", (it'll be more than ten to one), then realise how BMW have pulled off a masterclass of using an iconic name on an ordinary product to fool everyone that what they have is special rather than standard. There's nothing "Cooper" about a modern Mini Cooper.
Convertibles in the UK are like central heating in Doha. You might enjoy using it once or thrice in a year.
What makes me laugh is seeing people with the roof down in October, faces grimacing, teeth chattering, inwardly saying "I'm damn well using it regardless because people said I wouldn't!"