I heard exactly this reaction several times, when I told about my liking for the Creo. So much money for less motor and less battery when you can buy a Bosch ebike for half of the prize??? It's an ebike (where you don't really work hard), so whatfor any weight reduction???
I think most of us here know, that this isn't true and don't want to go back to a standard ebike 20 lbs heavier...
Of course you won't really notice 100g more or less and the range will be the same. But what matters is the amount of all weight reductions. I saved more than two lbs on my Creo Comp Carbon Evo (about 1/3 with better wheels&tubeless, 1/3 with throwing out the dropper post, 1/3 several minor changes). Also these two lbs won't really matter for the range. But they do matter for handling and agility of the bike, I can feel the two pounds less when riding it and I really enjoy it. Also the Creo is already such a light ebike that further weight reductions make more sense/are more noticable then at a normal heavy ebike.
But of course everything has it's price. The general rule of thumb for (european) weight weenies is 1 Euro per saved gram. If the saved grams are more expensive, a lot of people stay out of it. If it's cheaper, go ahead if you are a weight weenie!
My wheel set was far more expensive per saved gram, but the default whelels are really cheap and weak (for my weight&riedes), so I don't feel sorry. The same with the cranks like mschwett. I was expexting to need shorter cranks for gravel and if I had to change I would use the chance for carbon ones. But so far I feel fine and without pedal strikes and only the saved weight to money ratio is not very good for the carbon cranks.
Ok, that's more or less the weight I found so far in the web for the carbon cranks
But are you sure with the weight of the stock ones? I was pulling of one crank a few months ago to get an idea of the weight and I remember about 187g (I think already with nuts). So I thought for 20g per crank it's not worth the change. Unfortunately I forgot to take a photo of the balance, but I'm sure it was far from 225g. Or are the different alloy cranks on the Creos?