I think if I went the cycle to work route - I'd be a bit pragmatic about it.I assume you use a cycle cape with a sou'wester hat and your bike has proper mudguards . The capes we used were bright yellow and made us feel as if we had been washed up just off Cape Horn.
Wet weather gear is a bit better than z So'wester these days... but if it was bloody awful weather you'd take the car lol.
The big advantage of the e-bike over the "analogue" pedal cycle is I think, that you can ride a respectable distance without arriving sweaty, smelly & knackered for your days work.