I suppose I've just never experienced any real frustration with my harp bridges. I might also have a wider range of what is acceptable in terms of action satisfaction. I've always liked my basses to have what I consider "medium-low", but I've never bothered measuring. I just set it until it feels right and where I can really dig in without the string vibration choking out on nearby frets. Compared to the upright basses I used to play, even a Starfire with medium-high action would still feel relatively easy to play. My criteria are basically just no notable fret-buzz/string-choking and of course it has to be low enough to where the intonation doesn't get thrown off by fretting. I've only ever had one other bassist play one of mine and tell me that the action was too high for him. That said, he plays a very nice German-made Warwick Thumb bass with a light touch, round wounds, with slappy/tappy stuff mixed in, and his action is crazy low (I believe the bass was Plek'd as well). Pretty much all my other bass-playing compadres remark on how comfy my Starfires and other basses are to play.
Sidenote, for fine-tuning action on your harp bridge, you can also file the slots on your saddles deeper as needed, much like setting the action on an acoustic guitar saddle. I've done this, mostly on the outside saddles, when you want it a touch lower there, but the string next to it fine as is. Of course, you just want to avoid going too deep, because then you're either stuck with it, have to shim the saddle, or get a new set.