Not that most will need reminding but, mongrelnomad really knows his pens and so any recommendation from him has to be taken seriously....I quite like the thought of a pen that could look after itself, that could be tossed into a bag (all mine are kept nib up) and that would still perform as you say yours does mongrelnomad.
Opinions vary, or in this case, one person's ceiling is another's floor. I expect to be able to toss a pen about routinely in a bag and have it work perfectly on demand. There's nothing special here. The Conid line and concept are well worth our attention, but not for this reason. The disadvantage of the bulk filler, in common with all piston-type fillers, is that it must be filled by a bottle rather than a cartridge.