I pay attention to how much a feat is worth.
Feat = 8 Proficiencies
Half-Feat = 4 Proficiencies
That said. Some Skills are better than other Skills.
Perception = 2 Proficiencies
The "good skills" (Arcana, Athletics, Persuasion, Stealth, Survival) = 1½ Proficencies
The "normal skills" (Animal Handling, Deception, History, Insight, Nature, Slight of Hand) = 1 Proficiency
The "meh skills" (Acrobatics, Intimidation, Medicine, Performance) = ½ Proficiency
The "worthless skills" (Language, Musical Instrument) = 0 Proficiency
The UA playtest handles Languages perfectly: Common + Background Language + Choice of Language.
Make Musical Instruments free with Performance. Performance might have one style per Proficiency Bonus, including Song, Dance, Acting, Painting, etcetera, and Musical Instrument. Beef up the Performance skill, such as when crafting an item, use Performance to determine its esthetic appeal to improve its gp value.
Merge Athletics-Acrobatics into the same skill. In other words, use Athletics for all physical stunts.
Use Medicine to make Poison, and other applications.
Because the Class and the Background will have already selected Perception and most good skills, a Half-Feat should grant at least 3, preferably 4 skills.
I assume some Tool Proficiencies are better than others, but I havent looked closely at them yet.
Those feats like Prodigy that grant Skill Expertise are powerful and solid.