I have nephews who are tinkering with Java and python, and I assume will be hitting docker at some point.
You're being incredibly nitpicky over a reasonable example of why PC is not as plug-and-play as a console. On a console, the game will work. On a PC, there are a lot of factors that may prevent it from working.
The entire "use a PC" premise is that the PC can be useful for gaming as well as for non-gaming uses, and the counter-argument is that those non-gaming uses can easily cause problems for the gaming uses. Docker is not the only example, tools like fiddler or wireshark or ghidra could cause problems. But heaven forbid that a gamer on hackernews be a tech enthusiast, right?