This is exactly the point. We are not going to create a feat that simply gives optimal dps while also allowing you optimal combat flow. The entire point is to create a decision point to think about and plan your flow around whether/when you would like to gain/use it's benefits and when you would like to not.
We are not going to create an Archer's Focus variant that has substantial bonus DPS without having to sacrifice something actively to utilize it. If we were to do that we would make a passive feat with just static boosts but there are plenty of those already.
It's a "Feat" Bonus which means it stacks with all other sources.