What logic? He says "codec packs should not be used" then suggests Shark's.
"Codec pack" is a relative term. Basically, all Shark's pack is doing for you is simplifing the config of FFDshow and Haali. Six of one, half-dozen of another.
If this setup doesn't work for you, you fall into one of two situations: 1 - You have some obscure filetypes or software you are running. Avoiding this situation would be ideal, but if you can't help it, it's understandable. 2 - Something else has jacked up your system. Installing the typical codec pack, such as K-lite or CCCP, is only going to be a temp fix until the offending piece of software decides it's time to reclaim it's default settings.