Congrats to the Scylla team! These features and performance improvements are pretty huge for people working with Apache C* that want to evaluate Scylla. Compatible storage formats will certainly make evaluations much easier. Also, hope the Scylla experience with MVs is better...
As far as compatibility w/ Apache Cassandra 3.x+, is there anything outstanding?
Junk title, but you can apply this article's critique to many communities in general (especially online ones with a myopic user base). On the whole, the StackExchange sites contain a wealth of information that's readily accessible and can't be duplicated easily. There's certainly room for competition that's not just a plain forum, but what that looks like I'm not sure.
"Harmful" though? Have we already forgotten "experts-exchange" so soon?
As far as compatibility w/ Apache Cassandra 3.x+, is there anything outstanding?