Another issue in addition to those mentioned is maintenance. Typically, highways are only resurfaced; only the top1-3 inches (out of a foot or more) of asphalt are milled off and replaced. The finished product is essentially good as new and remedies all cracks, potholes, etc… if done at the appropriate time in the pavement's lifecycle. However with PCC, the only way to properly repair any defect, no matter how minor is full depth reconstruction of the entire slab, typically around 60' long, down to gravel. Not only is this obviously way more expensive, but would necessitate daytime lane closures; because
1) can’t run highway traffic over gravel and
2) even if the existing slab could be excavated and a new one placed overnight, concrete typically takes 4-7 DAYS to cure enough to handle traffic, as opposed to HMA which is fully cured* in time for the AM rush.
To avoid this, usually "band aid" repairs are made, which will preserve the structural integrity of the roadway, at the expense of significantly reducing the ride quality.
PCC roads will typically last longer and better handle truck traffic than HMA, so its a trade off between more frequent, easier maintenance and less frequent, giant PITA, basically build a new road maintenance. MassDOT happens to prefer the former since the lifecycle costs still come out about even and its less of a headache.
*HMA doesn't chemically cure like PCC, the asphalt binder just cools. Heat it back up and it becomes mix again. Hence why HMA is the most recycled product on earth.