On the other hand, waste is a literal side-effect of all possible life, going all the way to level of entropy always increasing. All life processes produce waste, even digital life would produce waste heat and whatever electricity generating process it consumes from can’t be 100% efficient.
I view modern packaging as a really amazing invention. People can mail me a fragile piece of art from across the world and it can reach me quickly and safely. Factories can massively produce safely sealed food items that prevent literally tons of food waste through packaging, increasing nutrition availability, water availability and more.
Most modern packaging is virtually a miracle.
Where I agree with you about packaging waste though is when it is used for branding and designed around aesthetic form or market testing rather than utility. Disposability is not a harmful goal at all, but waste generated purely to support branding is hard to defend.
It seems like one of those things that sounds like a big deal, like recycling, but when you look into it, it’s actually not cost effective to address it except a few special cases.