I have all of these options at my disposal. First of all, any streaming option that downsamples the video is straight out of the question.
As my PS3 is hacked to play MKVs and use NTFS drives, that is the most straight forward way to play them and often what I do. For things that I intend to keep as long as possible, I burn to BD-R to put on the shelf and keep as a physical backup to whatever HDD(s) it may be on. It also allows for portability so I can easily bring it to a friend’s house, or make a 1:1 copy to give to a friend in some cases.
I didn’t say anything about downsampling, the whole point of using a computer is to avoid that, even the FireTV Stick option I stated to sideload Kodi, which plays the file straight, not downsampled like Plex or something along those lines would do.
And it is great that you have a hacked PS3 as your straight forward way to play files, but you do realize that this is very much the equivalent of having a PC dedicated to being a straight forward way to play files… It is the exact same point I was making, just with a slightly different hardware choice.
edit: nevermind