Apparently those advocating stuff like Docker for OS agnostic languages never saw them in first place, probably busy in kindergarten and now pushing for Docker + WASM instead, 10 years later.

Yep. The last company I was at was a Java shop. We had no need for containers. We built a fat jar for each "service." A deploy was little more than copying that fat jar + configuration file over. Multiple services easily ran without Docker.

This approach was way lighter weight than pushing enormous images around.