iOS, with its single hardware manufacturer, has been 64-bit only since 2017. Android has a million moving parts split across a bunch of different companies, so getting to 64-bit only is going to be a long road. Getting there is worth the effort, though, with a promise of increased performance and additional security features.
Is there much advantage in 64-bit tech?
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We really need for the phone makers to stop acting like RAM (and storage for that matter) is worth more than gold. The jumps in prices in various storage versions of phones wreaks of profit markups. Like how stores will take stuff like HDMI cables that cost like $2 to make or buy from the cable makers. But then turn around and put “fancy” sounding buzz words on the box and charge $50 for them. I can’t believe how long it has taken for even mid and high-end phones to get 4GB or more of memory. But I am guessing at a certain point they want to make sure the devices start to “feel” super slow to keep people upgrading ever two years at least.
It’s not just that. AArch64 is a different architecture than AArch32. For one, there are more registers available on AArch64. Also, 64-bit architectures also let you do tricks that are not available or are indefensible with the smaller address space that a 32-bit processor provides.