I thought maybe there would be an improvement via a software update with the iPad because for how many mini-LED zones the display has, the blooming shouldn’t be as bad as it is and since Apple reduced blooming just months later with the MacBook Pros. However, it could just be that they’re fundamentally different mini-LED displays and Apple can’t improve the current iPad Pro panel with software any farther. If they haven’t done it so far, almost 2 years since release and with the new M2 model, I don’t see why they’d do it now.
I don’t really think there’s a fix to completely get rid of blooming on mini-LED displays though. The whole reason there is blooming is because the pixels are separated into zones that each have one backlight behind them. Blooming happens when just a small amount of pixels in that zone needs lit up, but since it can’t just light that one/few pixels only, the entire zone has the backlight turned on behind it. The reason OLED and micro-LED solves blooming is that each individual pixel has a backlight behind it. So an entire cluster/zone of pixels doesn’t need to be turned on for just one or a few pixels. Only the pixels that are supposed to have a backlight turned on will have it.
So, for example, your 11” iPad just has one big backlight for the entire screen. That’s why there’s no blooming but there’s no pure black pixels either. Every pixel always has the backlight turned on behind it. The 12.9” iPad Pro has ~10,000 zones/clusters of pixels with one backlight per zone. You can get pure black pixels if the entire zone is turned off, but if any pixel needs lit up in a zone, the entire zone must be turned on, leading to blooming. For OLED and micro-LED, each individual pixel has its own backlight, so no blooming.