In the subject line the question was asked "is it blasphemous to ask how you think a Roadini would compare to a Crust Malocchio?"
No, I don't think it's blasphemous to ask that. I think they are very different bikes for sure.
Then the OP goes on to say "I know we're not supposed to talk about weight but..."
I think you misunderstand. Lighter is almost always better, all else being equal. Everyone knows this. If everybody had a gravity knob on their bike, we would all peg it to the minimum. That's a fact. Lighter bikes are easier to carry. Some people prefer the feel of a lighter bike because they can "throw it around" more. The thing that gets contentious is when people make statements like "That particular bike weighs X, therefore it is a heavy slow pig, and nobody can be happy riding that tank". Or when people say "I have a 22-pound road bike and I love it but I can't keep up with the club rides, so I'm looking for a 18-pound road bike because it'll go 5MPH faster".
It's fine to want a light bike, or to be curious about what a bike weighs. When I do a "light build" I weigh every part, because I want to know. I know that whatever it weighs, it's going to go a teeny tiny bit faster than if it were heavier. The exchange rate is 12 pounds per MPH. Some people get mad that the exchange rate is 12 pounds per MPH. They want to claim "no way. I upgraded my road bike and dropped the weight by 1.5 pounds and now it's WAY faster". The pointless discussion argument is claiming light weight --> much faster. Just leave it at "I want a lighter bike because I feel like it". It's fine to decide "I don't want to buy a Roadini because I don't feel like buying a >20 pound road bike".
Anyway, the reported weight of the Malocchio is very low. They claim frame and fork combined are under 6 pounds. Even with a headset it may still be a hair under 6 pounds. My Rivendell Legolas weighed 6.30 pounds frame+fork+headset, and that's about as light a frame as Rivendell can make. My Roadini weighed 7.75 pounds for frame + fork + headset.
If you feel like building up an 18-pound road bike, it'll be a lot easier to accomplish on a Malocchio than a Leo Roadini. Aside from their weight, I think they are very different bikes. Most people see "different" and want to decide which is better. I see "different" and use it as an excuse to buy one of each, and enjoy the differences :)
Bill Lindsay