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I doubt the steel frame is heavy as you described it to be, for instance, this is 6.04kg;
This is 7.5kg;
I'm sure the owner have a reason to choose a steel frame over the alternative...

That fast boy frame is never as light as those. The ones you have pictured are compact frames with a tight geo.

I'm all for steel being used to build frames, those wheels just make more sense on a carbon frame.
Whatever.. it probably rides really well, if a bit pricey.