Based on Google's earlier testing HTTP/3 excels in poor-performing networks where dropped packets are more likely or more costly. Cloudflare's blog didn't mention this point at all.
> On a well-optimized site like Google Search, connections are often pre-established, so QUIC’s faster connections can only speed up some requests—but QUIC still improves mean page load time by 8% globally, and up to 13% in regions where latency is higher.