As I'm aware, STEEM is built on BTS. Looks like the need for the complex calculations isn't a key thing for STEEM it at all.
EOS is built on ETH it should have adopted the ETH maintenance intervals. But as far as I understand, it's not always the case.
Actually, EOS is not built on Ethereum. It's a standalone blockchain. Only their ICO/crowdsale took place on Ethereum. The EOS token is currently an ERC20 on Ethereum but that is only a placeholder token until the EOS chain launches in a few months.
Ups..correct. I've totally messed up their ICO with the actual EOS chain.
Thanks for correcting us ... i also thinks that eos is built on etherium.