The Issue With A2 SD Cards
Keep in mind that A2 SD card manufacturers are not fully honest when in comes to their product marketing. They can promise you blazing fast speeds, but it’s far from guaranteed. The thing is, A2 is not as “self-contained” as A1, and it can have different performance on different devices. For instance, there are no benefits in using A2 SD cards on Raspberry Pi 4, although this board and its operating system are really new, just a few month old. Many hardware and software components are not ready to utilize A2 standard, so you may end up overpaying quite a bit for an SD card you won’t be able to use at full speed. Here is more information on that issue.