Decentralization isn’t good in itself. It’s a price you pay to buy a specific property — censorship-resistance, credible neutrality, no single point of failure. The property is the point; the decentralization is the invoice.
So the honest question is never “is this decentralized?” but “which property do I need, and is this the cheapest way to buy it?” If you don’t need the property, you’re paying for latency, coordination and complexity you could have skipped.
Related: robustness-as-one-number asks a neighbouring question — not what a system buys, but how gracefully it fails.