reading magic items section, this baseline ability increase pretty much null and voids magical items along the lines of Girdle of Giant Strength and Gauntlets of Ogre Power (among others i'm sure), just purely from a melee perspective.
Also if you think logically about this? Can you really improve Intelligence or Dexterity in Real life?
Intelligence is granted at birth in effect through geneology, Dexterity also lies within this realm, with fast twitch muscle fibres? Charisma is geneology
Strength can be improved upon slightly through work, but not tremendously without roid/HGH usage - could be a possibility, Wisdom can be improved upon. Constitution arguably can be improved upon with work/training etc but also has geneology involved.
So yeah, I have some issues with this baseline somewhat, for certain abilities baseline.
Travalyon - Level 8 Paladin - Sacred Oath: Devotion - Fighting style: Defence - Feats: Tough - (Flametongue Sword / Spellguard Shield / Ring of Acid Resistance / Platemail) - Lawful Good - Amaunator
Baldwyn - Level 8 Fighter - Fighting Style: Great Weapon Fighting - Feats: Great Weapon Master, Tough - (+2 Greatsword "Hazirawn" / +1 Platemail / +1 Dagger / Gauntlets of Ogre Power) - Neutral
Audric - Level 8 Cleric - Divine Domain: Life - (+1 Mace "Dragon Thumper" / +1 Shield / Platemail / Boots of Striding & Springing) - Lawful Good - Amaunator