There are many new altcoins with many additional functionality at present time. Such additional functionality is strong ruled in their blockchain rules. I think many of such functionality can be realized over dtc blockchain because of its very raw data storage nature.

But many of dtc applications cannot be realized in such altcoins in reverse order. It is because of such additional blockchain level rules.

If metadata means such blockchain levels rules that limit application of dtc or add overhead then I against it.

May be I still misunderstood something.

I think it is not possible to create standard metadata rules and demand its obeying to all users. And it is normal.