Basically exchanges and sites like Coinbase only need block explorer to verify transactions in case of wallet sync errors, and of course separate wallet daemon or wallet daemon integrated in node daemon. Source code of Steem command-line tools are not the easiest to work with and that might be a barrier for listing. It doesn't really help that running Steem node requires quite a lot of I/O resources. Some exchanges that already did list Steem have disabled it because of daemon instability.
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Does the migration to MIRA change any of that?
I don't think so... MIRA might reduce RAM usage, but doesn't really change the complexity of blockchain internals and the code itself. Nowadays RAM is cheap, but disk storage is expensive due to higher price per TB of solid-state disks (SSD).