in classic Microsoft fashion [0], WSL1 is not officially abandoned, but seems to be planned to be left in half-finished mode forever. bugs are closed as "fixed-in-wsl2" without further comment: https://github.com/microsoft/WSL/issues?q=label%3Afixed-in-w..., including serious bugs causing incorrect computations: https://github.com/microsoft/WSL/issues/830.
[0] see the dozens of official Windows GUI frameworks: https://news.ycombinator.com/item?id=16736720 (and since then, it's gotten worse: https://www.google.com/search?hl=en&q=uwp%20deprecated)