I don’t think that sort of gear is useless. It has its place depending on your circumstances and those who choose to have it really need to become familiar with it and its limitations. At the least, a means of securely carrying spare mags is an important piece of kit. A light-weight chest rig can be covered up beneath a light jacket without being too obvious and drawing unwelcome attention. I doubt we will be tossing our empty mags since acquiring additional mags could be difficult or impossible. A roll-up dump bag on your belt will be invaluable.
Lots to consider.