Why do Bluray discs look like this?

Why can't they just be a simple mkv on a disc?

>>105995309 (OP)
If it's one of the older bluray disc, you can just find the largest file and then rename it to mp4 and it will work.
If not, flash libredrive and use makemkv to rip them

they are, though. many movies are just a single .m2ts video file. sometimes they're split but you can join them.
with dvd they were practically always split into multiple .vob video files, because that disc format had a 1GiB file size limit

>>105995330
>rename it to .mp4
why? it's in m2ts format (mpeg2 transport stream). if your player doesn't recognise that (for some reason, it's not that uncommon), then rename it to the more generic .mpg instead. .mp4 is a different format. in many cases you can name it any video format extension and your player will figure it out anyway, but it's not really good practice to use the wrong extension

Just use makemkv bro the license is free

But what is all the other stuff for?

>>105995357
menus and shit

>>105995355
>why?
Because you're specifying the container, not the content. Either container can contain an m2ts stream