The Boost trait needs errata badly, as it does not specify a duration.
One could just pre-boost all of their boostable weapons for sweet extra free damage on round 1.
However, it gets worse.
Take an Operative with Instinctive Aim, or any other feat or feature that lets you draw for free.
Equipment: Duo Enhancers, one improved weapon (any), many commercial Boom Pistols. There is a limit on how many you can carry imposed by Bulk, but I expect they'll soon print an item like Sleeves of Storage to raise it.
You pre-boost all your boom pistols ahead of combat. Enjoy an extra d8 for each d6 of your pistol, once per round (or more, as soon as Paizo prints a class with a Draw->Strike compression feat).
This becomes extra bad with Automatic Bonus Progression rules, where an Operative with Twin Draw (or just a skittermander) can draw 2 weapons for 1 action. Trigun priest anybody?
This has to be working as intended, as these changes to boost are literally the only good thing that happened to ranged weapons and they claimed they did something to make ranged weapons not suck.
Ergo, taking a boost weapon at low levels is what you're expected to do if you're not deliberately after some other trait or weakness trigger.