Curious About an Additional Weld Line on a Narrowing

Oldmanmopar.....A question for you if I can ? This car won't ever see anything past 85 MPH, and even that is a STRETCH......do axle housings see flex under normal driving conditions ? I'm honestly not sure.....heck, if I were on a Million Dollar game show and the final ?uestion to win that Millsky was to define a "hole shot with sticky tires" mannnnnn, I'd have to look at the Wifey and say, "sorry Babe, we're leaving with whatever we came with because I have no idea as to what that means".....so yeah, under nonracing conditions, is there much flex to where the housing is no good ?