How do Nvidia's Ampere RTX 30-series GPUs stack up five years later?

Nvidia launched its GeForce RTX 30-series GPUs with the RTX 3080 10GB card on September 17, 2020 — very nearly five years ago as I write this. It followed that with the RTX 3090 one week later, and then the RTX 3070, RTX 3060 Ti, RTX 3060 12GB, and RTX 3050 8GB over the following months. A bit less than one year after the initial launch, Nvidia then released the 3080 Ti and 3070 Ti, with the final RTX 3090 Ti coming in the spring of 2022.
The GPUs were all good on paper, for the most part, but at the time of launch virtually every one of these graphics cards ended up being a massive disappointment for gamers. Pardon me if I'm dredging up old memories that might still cause PTSD, but late 2020 through early 2022 was a perfect storm of awfulness in the graphics card industry. Ethereum mining was massively profitable during portions of that time, to the point where miners were scooping up every viable GPU and were often willing to pay over triple the MSRPs. On top of that, we had the Covid pandemic causing more people to work from home — or stay home to play games — and plenty of folks were upgrading their PCs. Massive GPU shortages ensued.
But now all of that is past, and we have had two new generations of Nvidia GPUs in the interim, the RTX 40-series using the Ada Lovelace architecture arrived beginning in the fall of 2022, and then the RTX 50-series with the Blackwell architecture launched at the start of 2025. You wouldn't necessarily go out and buy a new RTX 30-series GPU today, but how do these older generation GPUs compare to the modern stuff?