Leavener example might be genuine tweak because they thought it would be better but it could easily be cheapening of ingredients which is a problem with premade mixes too.

The box might be the same volume but i'd expect most mixes wouldn't taste the same these days either. Any mix with chocolate in particular has had the cocoa quantity + quality reduced to the point I can often barely taste it because it's such a comparatively expensive ingredient.

Who else has family recipes with "can of X"? that can of soup from 50 years ago is not the same as today for the worse. I know one of my parents recipes will be gone forever if the creamed corn they use is discontinued or changes to be like every other brand.

The “healthy request” or “low sodium” cans will have potassium chloride and sugar added, compared to the conventional.