The additional bonuses you unlocked for reaching a particular level internal to a skill have always been called "perks." In fact, reference
The Elder Scrolls IV: Oblivion Official Game Manual (the one that came with the game for both XBox 360 and PC... yes, I have both...), listed in the Table of Contents under the entry for Page 20:
Skills, Mastery Levels, and Skill Perks
Upon turning to Page 20 we find:
Skills, Mastery Levels, and Skill Perks
As you rise in proficiency with skills, you gain Skill Perks at new Mastery Levels. You will eagerly anticipate the special benefits of these Skill Perks each time a skill is raised to a new level of mastery. A red number indicates the skill has been damaged. A green number indicates the skill has been increased by magic.
That, my friends, is verbatim. Does anyone actually read the manuals before they play a game. At any rate, it would seem that calling them perks actually reminds you of a feature that migrated from TES to FO. Not vice versa. All names and such aside, does it actually matter what you call them? Does it change how the game plays? Does our whining about it make anyone here honestly believe that it will be changed? I think not.