Yes, the miner’s binaries are used both for mining and for verification of incoming block’s proof of work. So you do need those binaries even if not mining but just for verification. The ARM support is not out there yet.
As the network matures and more miners join in, an incentive will be created to rather lend the proprietary miner software for 2-5% of the reward. This is quite common, and this is actually a good way of reaching decentralization.
Edit: You do not need the miner for verification. See here