My guess is cuz TiTS went at it smart and only thing TFs give you is passive benefits? like having fur makes you immune to cold draining your HP thus you don't have to change your gear for something with less defence but more cold protection when exploring Uveto.I thought TiTS had hit a pretty neat sweetspot. As if you balance your game correctly, TF'd skills don't actually matter as they would just be sidegrades/downgrades to stuff you can get or have already gotten.
Or how the Wings TF let you hit flying enemies in melee if you don't have a perk that already takes care of that, etc.
Still gotta say it sucks balls they keep taking away shit from the main character, in fact Imma go play TiTs instead.