Does Aerobarrier/ACH50 below 3.o make sense without managed ventilation? – GreenBuildingAdvisor

I am a member of a cohousing condo project that will soon be building to 2018 code minimum in zone 4B.  If the county enforces code we would at least get to an ACH5o of 3.o.  The ventilation “system” is bathroom and kitchen fans. 

The only energy improvement I might have an opportunity to make in my unit would be have an Aerobarrier contractor come at the appropriate stage of construction. I might be able to get permission to have passive vent with a filter installed in an exterior wall before the housewrap and stucco go on..  Getting a set of Lunos ERV units installed would be a bigger stretch at this point.  A ducted HRV/ERV is almost certainly out not going to happen.

My question is, does it make any sense to try to knock down the ACH50 without managed ventilation? I will be monitoring indoor air quality, but I may end up having to turn on a bathroom fan and open a window when I need fresh air.