[user3939382]

So you put extensions in the spec you don’t make it impossible for anyone else to implement. They knew open source suites were competing with them they did it on purpose.

[quotemstr]

> So you put extensions in the spec

... which are either public, in which case people complain that the spec+extensions is too long instead of that the spec is too long, or

... which aren't public, in which case people complain that there's no interoperability.

You can't win.

> impossible for anyone else to implement

Except for all the people who did implement it?

[fsflover]

> Except for all the people who did implement it?

It was never fully implemented. LibreOffice has been trying since then and there are always problems.