Significant weight savings
On a bike as heavy as the Connie an end can would need to be made of paper to get anywhere near a (what I would call) "significant" weight saving.
I mean even a 1% saving (which I wouldnt call significant) is approx 3.5kg/8lbs and I can probably save that much by having a good #2 before riding
To be significant it would need to be at least 10%
The only real valid reason for changing the can in the real world where you aren't measuring things to the nth degree is cosmetic (looks or sound)