I’m not quite sure I understand your question. No speaker is technically perfect or anything even remotely aproaching that. The perfect speaker would be a single driver omni-directional point source of 100% efficiency, zero mass with a perfectly flat response well beyond 20Hz to 20kHz with no need for box (or worse port) reinforcement. It simply does not exist.
The JR149s are a very nice little mini-monitor, ground-breaking in their day and still very respectable today for their size. They measure well for a little sealed-box stand-mount, but no, they are very far from technical perfection. As is every other speaker on the planet!
I ask because when I owned a pair recently, an engineer friend of mine was invited round for a listen, I wondered what he would make of this speaker, he said & I quote, "this is easily the best speaker I have ever listened to"
These were, at the time, linked to a Naim Nait 3 amp streamed from my laptop through a music streamer 2 dac, sitting atop a pair very lightweight Soundstyle metal stands in a 3.5m sq room around 35cm from a back wall.
We like what we like at the end of the day .i prefer my Royds, which measure all over the shop technically, the jr had it in the mids, exceptional, never heard a speaker lock down a midrange like these, but the bass was all wrong in my room, pity.
Point being, many engineers go on the technical side first, Audiophiles listen, the rest is mainly down to needs, power, sensitivity etc..rather than a real need to understand, I know you enjoy this side of it, as do others but doubt you would dismiss a product on specs alone or render it useless based on measurements, if audiophiles did, Naim would never have left the blocks.
If an engineer is asked to sit down & listen without getting bogged down with measurements, it's interesting to see their reaction, if I had requested he measure them first, I imagine his reaction may have been a little different as his expectation bias would have changed.