Point Blank Shot at L4 was a brilliant idea in v5, that gave rangers a little bit of compensatory shooty power.
But since Improved Critical became available at 6, it's become a cursed feat.
If you wait for your free Point Blank Shot at 4, you don't have enough feats to get Rapid Shot and Improved Critical at 6.
Steppes Archer got given Point Blank Shot at L1, solving this issue. Plus +2 undispellable DEX and free good arrows!
Giving Ranger Point Blank Shot at 3 would be enough, as then you could take Rapid Shot at L3.
Giving Ranger Rapid Shot at 4 or 5 instead could be interesting. Wouldn't boost the power of a Ranger dip, but would mean you can have the same feat stack of Point Blank/Rapid/Improved Critical that a Steppes Archer or Marksman can have. And would open up the possibility of playing a Zen Archer caster-ranger without having to take 13 DEX.
Even though you are far weaker with the lack of a stacking DEX boost and free ammo.
Or, instead of that, give Rangers the Barbarian treatment and allow them to take a fighter feat at level 7. T'would give the class more diversity.