Just began researching Crown.  Longtime masternode operator, but my level of involvement in other projects has kept me head-down for a long time.  So, I have a few questions.

• What sets Crown's NFT platform apart from any other platforms offering ERC-721 alternatives?

The main difference is that you don't have to implement contracts and deploy them to the network. Instead, you have to predefine a set of specific params for your token protocol and use APIs for registering and managing them. You can read the details in the article pointed by jeliman.

• To what degree is the NFT platform scalable?  If it is highly scalable, how?  I like it when projects pursue scalability in a proactive manner.

The implementation is made with scalability in mind. Please specify what exactly do you mean by scalability in this case? Are we talking about transactions throughput?

• Are governance proposals & voting records retained historically?  If so, where can I view this?  Would especially review proposals where Core design decisions were made via governance & carried-out.

The governance on-chain part is partially implemented. There is still work to do to complete it.
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I might have more questions, but this is all for now!  Many thanks in advance.