B17s used to be a lot stronger, also used to never catch fire. As they are remodeled, the damage system is re-mapped and re-built to fit the new model.
A re-modeled lancaster would at least catch fire, would accept the rounds shot into it, and wouldn't have so many tiny black holes that swallow damage up with no result.
That's why I want it, because it means they remodel the damage on it.
P.S. The B-26s sometimes have similar issues, but it's way worse on the lancasters.
P.P.S. To illustrate the issue with lancs, I popped one in the wing with a B-25H's 75mm gun. It was close enough inboard that I was expecting the blast radius to blow up the entire plane instantly (like a rocket) but instead it just lost a wingtip only. It spiraled out and I got a kill, but it was very lackluster.