They've always been prone to adding fussy 'bits' to things that would have been far better without.
A few yrs ago in a tiny independent shop in the US I bought a lovely summer jacket - plain, unlined linen in a deep pink - with nice buttons! And it washes beautifully. It was made in the US, $70.
And I thought at the time, why on earth, with their economies of scale (so able to do more cheaply) don't M&S do plain but stylish basics like this, in some 'good' and zingy colours? But sadly I'm sure they'd manage to mess it up - colours would be not quite right, and they'd have to add fussy 'bits' and very likely horrible buttons, too.
My mother, who was very style conscious and had a good office job at M&S London HQ before she married, was offered the chance to train as one of their buyers. She always regretted turning the offer down - I dare say she'd be turning in her grave if she could see what their buyers are doing now.