The way I understand it is more like "without the ease of use provided by X, even though I could have done it, I wouldn't have done it because it would require time and energy that I'm not willing to put in".
Since we're talking about self-hosting, to me the main focus is not skill set but time and energy.
There's the same debate around NAS products like Synology that are sold with a high markup, meanwhile "every SWE should be able to make their own NAS using recycled hardware".
Sure. And I did all of this: - homemade NAS setup - homemade network setup - homemade mediaplayer setup
It was fun and I learned a lot.
But I moved to some more convenient tools so that I can just use them as reliable services, and focus on other experimentations/tinkering.
To be honest, the fact that you insist that Plex is just "file sharing" that can be replaced by torrents makes me think you either don't know what Plex actually is, or you are acting in bad faith.