People buy 18-core Xeon W iMac Pros with 64 GB RAM
So?
"People" buy Semi trucks with 800HP, doesn't mean that needs to be your next commuter car.
Which is more or less what the OP claimed.
Or in short "Unified Memory 16GB is shared You need 32GB" is as much a sign of someone lacking even the most basic clue about tech as that thread claiming that 16GB shared would somehow be as good as 32GB.