How come PST:EE comes with the vanilla version but other EEs don't?

How come PST:EE comes with the vanilla version but other EEs don't? I would really like to see BG1:EE, BG2:EE and IWD:EE to include the original, unaltered versions aswell.
P.S. Does PST:EE include the vanilla version inside the EE engine or as a separate product?
P.S. Does PST:EE include the vanilla version inside the EE engine or as a separate product?
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https://www.gog.com/news/definitive_edition_bundle_baldurs_gate_i_ii_icewind_dale
https://www.gog.com/news/release_planescape_torment_enhanced_edition
Only thing I could think of... On a minor note, I totally wouldn't mind having a button when creating a new game if we want to opt out of some of the EE stuff (because I really hate Neera interrupting my party fetching because of a Red Wizard, or Rasaad's kung-fu yelling scaring me when playing with headphones).