What you want just isn't on the menu. Since you're someone who has enough apps and takes enough pictures that a 16GB version of your current phone is not enough, you want a 32GB, because the 32GB you have tends to be about 80% full. But with a higher resolution camera, and higher resolution/higher frame-rate videos, that 32GB would be inadequate. You'd have to change your habits and take less pictures to keep the newer phone at 80%. If you're really proud of only needing 80% of 32GB, then of course you will be pleased to change your behavior to stay at your perfect percentage point.Erm, because things either get better or they get cheaper. iPhone storage has stayed the same. I want 32GB and I'm still paying the same 100$ for it. The additional 'free' 32GB might as well not be there.
Most people who are comfortable with a 32GB model of an older model will find that 64GB is the new 32GB. They can take the same number of photos and videos, with a better quality camera, and they pay the same for 64GB as they used to pay for 32GB.