Qi 2.2 charging performance
Qi 2.2 or Qi2 25W finally makes wireless charging universal for supported phones with Magnetic Power Profile (MPP). For phones / devices having built in MPP magnets - or a case with magnets - the alignment issues are solved, and the 25 watt charging speed is fast enough to remove most need for plug-in charging of phones. The Google Pixel 11, iPhone 17, and similar flagship phones natively support Qi2 25W, which allows true corded-like charging speeds with a robust magnetic interface. Qi 1.x has been widely available for over a decade, and has long been plagued in practical use with problems associated with a need for tight physical alignment, heat, and slow charging speeds. Note that while Qi2 25W devices are generally backward compatible, there are some older Qi 1.x devices including the Pixel Stand 2 that may not charge newer devices due to mechanical alignment issues.
The original 5 watt Qi was OK for overnight charging. USB-PD wired quick charging can yield charging in 30 minutes for 50%. Qi 1.3 Extended Power Profile (EPP) can yield 15 watt charge with appropriate devices and a 30 watt USB-PD power adapter. 15 to 25 watts is close enough to wired USB-PD, useful for top-off charging. Having adequate USB-PD input power (e.g. 30 watt wall power USB-PD adapter) to the Qi wireless charger is vital to meet full power charging specs.
The closer the phone (thinner the case) and better aligned the phone is, the faster and cooler it will charge. If the device is getting too hot, it will backoff the charge rate to maintain appropriate temperature. The thermal insulating effect of the phone case retains extra heat from charging.