The quick-release system is not a recent invention: the Omega Dynamic of the seventies already used a retaining ring screwed onto the case back to switch from bracelet to leather strap. What has changed over the last twenty years is its widespread diffusion and partial standardization, now present across very different price segments.
The basic idea is simple: to eliminate dependence on a watchmaker for routine operations. However, there are at least three distinct families. The first uses the traditional spring bar with a protruding tab on the inner side: by pressing with your fingernail or a pin, you compress the spring and the strap slides off. It's the most common system among independent brands and mid-range manufacturers, adopted in proprietary variants by Tissot, IWC with EasX-CHANGE, Straum and others. The second family consists of proprietary button or snap interfaces: Hublot One Click, Panerai Click Release, Cartier Santos QuickSwitch, Vacheron Overseas. Here the mechanism is integrated into the case or lug attachment, the change is a matter of seconds, but you're bound to the brand's ecosystem. The third is the keeperless system, which concerns the buckle and the free end of the strap, not the case attachment: it eliminates the fixed loop, simplifying aesthetics and reducing overall thickness.
From the workbench, I often see confusion between declared speed and actual speed. The spring bayonets on the Tissot PRX itself, for example, are technically tool-free but practically inaccessible because the gap between case back and strap is minimal: you need thin fingers and patience. The principle works well when the designer has thought about the end user's ergonomics, not just the press release photograph.
One point that magazines overlook: proprietary systems create a long-term problem. If the brand changes architecture or ceases production of that line, the strap becomes an accessory that is difficult to replace outside the official network. The standard spring bar, however less spectacular, guarantees an open ecosystem that lasts for decades. I don't know if in thirty years Hublot One Click replacements will be as readily available as Bergeon spring bars are today.