There are many excellent high-end speakers with ported bass. But it really costs to design and engineer ports with materials & construction sufficient to smooth out airflow & eliminate “chuffing.” For example, last fall I heard the Harbeth monitor 40.2 & was wowed by that sound. The bass had good impact & reach, and what struck me as extremely natural “bloom” (bass notes start small, get larger, then fade). I could live with that sound all day long.
But subwoofer bass is a more demanding application. Instead of going down to high 30s/low 40s Hz like most full-range monitors, a large sub will go down into the mid-to-high 20s. That means large drivers, a lot of power energizing a heavy magnet, with driver excursion up to 3" – combine all that with a port and it just doesn’t sound right. The port may buys a few Hz on the bottom, but it screws up the natural sound of bass notes in the rest of the range (up to the usual 40 Hz - 80 Hz crossover).