I think it's permanent as in "the window was nailed shut permanently". It's the intent that matters, not the possibility that it may have to be opened from time to time. Perhaps we need a better name for it. Otherwise, practicality depends on the device. The OP's device looks as if it would need no cleaning, though I don't know about the effect on the piercing. Something like my surgical nylon cage seems wearable indefinitely. I've managed a month with no apparent issues... Regarding teasing and edging. Some of us don't want to be the centre of attention. Pleasuring my wife turns me on almost as intensely as edging would. As long as our dynamic is "live" I'm happy to remain chaste for long periods. I suspect I'm not alone in this.