Speaking of large batch files, if anyone has ever softmodded a Wii, there is a good chance you used ModMii, which is by far the largest batch program I've seen. The main script [1] is a batch file that clocks in at over a megabyte. I used to be pretty into the Wii modding scene and remember talking with the author of that script about random batch things a few times. I can't imagine maintaining a file that big.

[1] https://github.com/modmii/modmii.github.io/blob/master/Suppo...