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NPC EAC/KAC roughly correlates with 10+3L/4, which is non-Soldier/Solarian BAB, so players get an edge while leveling provided they invest in things like stat buffs for their accuracy stat, etc.
I think this logic is flawed.A CR 1 combatant has EAC 11; KAC 13.
A CR 20 combatant has EAC 35; KAC 37
A CR 25 combatant has EAC 42; KAC 44
I would use approximate enemy EAC as 10 + 1.6*L; And KAC as 12 + 1.6*L.
To maintain the same average accuracy from 1 to 20. A soldier needs to increase his to hit bonus by 24. He gets 19 BAB, 2 to 4 (depending on starting stat) from attribute level increases, 3 from a item based enhancements. Which means average hit rate should stay about the same from level 1 to 20 if you're a an optimized full BAB class.
It is slightly worse for explosive weapons though. The average combatants reflex save increased by 18 over 19 levels. And save target DC only increases by 10+Stat mod change or 15 if fully optimized. So no matter what you do, the chance your opponent will save for half damage increases over time.
A core belief in Starfinder seems to be every character will absolutely maximizes anything he does, if he doesn't he can expect to get progressively worse at it as he levels up.