Apart from a little confusion about how to configure the bootloader(since rpi uses uboot as opposed to the usual suspects), my experience has been amazing. In typical arch fashion, I've had zero issues apart from on install day.
Been running it on the rpis for years for similar reasons. Besides having most stuff packaged, it follows Arch principles and thus doesn't make unnecessary/unreasonable changes to software, my main complaint with most software targeting raspberry pi.
That being said, if you want to use e.g. the official RPi 7" touch display via DSI, you should also switch from the default upstream kernel to the rpi kernel unless you like to mess around with DTB and debug strange problems.
You'll need to become familiar with u-boot. Then you'll be able to boot this board and any other board with ease.
Might be easier to just install cargo and use cargo to install rust tools. I've found it's much less hassle than using a generic package manager.