You're slightly missing the point. Ultimately, it doesn't really matter to me, the end user, whose fault it is that my OS doesn't have codecs.

The problem is that when doing an extremely basic operation that works on every system I've used before, it doesn't work, and the most readily available advice on how to resolve the issue tells me to run commands. Regardless of the reasons why it is that way, it just simply isn't user friendly.

There are tradeoffs in life, not perfection. Bondage vs. convenience, your choice.

Having to install codecs once every few years is a tiny inconvenience compared to the dystopia offered elsewhere. I also run commands on Win and Mac all the time to fix things. For example Windows wastes tens of gigabytes of space unless you run a couple of inscrutable commands to free it.