Packing into PK3 is not working correctly

[Jekyll Grim Payne]

I removed the claim about memory corruption from the wiki. However, please do NOT store full WADs inside PK3s.

[sacarias]

I removed the claim about memory corruption from the wiki. However, please do NOT store full WADs inside PK3s.

Could you, user Jekyll, explain why this must NOT be done then?

[phantombeta]

[...

Could you, user Jekyll, explain why this must NOT be done then?

You were already explained this:

Then this would make user SPZ1 a complete fool, and either he has no dignity, or you are the one who doesn't, or this is a witch hunt for free.
Nothing makes sense here

This is needlessly hostile. The wiki is inaccurate about it causing memory corruption, but it's very much correct about it using up more memory (though it's not leaking it- the wiki doesn't claim it is, anyway). GZDoom decompresses the WAD in memory, then loads it as if it were a normal WAD, and to do that, it needs to keep that decompressed copy around in memory, so it's gonna use up memory that it wouldn't have if it were loading from disk.

[Jekyll Grim Payne]

Could you, user Jekyll, explain why this must NOT be done then?

I think it should be obvious from the wiki description, but I'll elaborate.

WAD is an inconvenient game-specific file format that requires specific tools to work with. PK3 is a simple and easy-to-setup ZIP archive.

A WAD is a bunch of files that only works when it's put in a specific order, separated with specifically-named markers, and file names in it cannot exceed 8 characters. It's an absolute nightmare in terms of organization. In contrast, a PK3 can have subfolders, does not need markers or specific order and supports long file names. And it also can be worked with an unpacked form, which lets you turn it into a repository, work with it using any editor you like instead of Slade, etc. In other words, it's a completely regular ZIP archive (or a completely regular folder, if you're using it unpacked). It's as close to what regular everyday interaction with files and folders looks like as possible. For all intents and purposes, consider PK3 to be the default.

UPD: I realize I was kind of answering a different question. The answer to why WADs must not be put in the root of the PK3, besides inconvenience, is that GZDoom will load all of those WADs into memory at once, resulting in huge overuse of RAM.