This doesn't mean anything, you've no idea how RAM works on a modern machine.
MacOS just looks at the amount of available RAM, and -without going too technical- allocates it in the most effective and beneficial manner. Even if you had 64GB of RAM instead of your current 32GB of RAM, the distribution would have shown a similar case.
16GB is still the right amount for the average consumer, like most of us are and its going to stay like that for quite a while longer, I can guarantee you. Also, that extra bandwidth looks nice on paper, but benchmarks have proven that only in heavy workloads, it makes a small difference. Definitely not enough to spend hundreds of dollar extra....
So, for the love of god, stop spreading nonsense like "32GB is the new 16GB", because it is NOT.