I find it hard to believe that there is a "one-size-fits-all" LCA solution.
I believe much more in an array of solutions that covers different aspects, regions and needs that people have.

That is why LCAx is created as an exchange format. It is much more interesting to enable collaboration between teams, products and solutions rather than providing THE solution.

The idea of LCAx is to create a foundation, where i.e. the building owner can compare two competition proposals' LCA results, even though they are made in different software.

It is about creating the infrastructure for enabling others to do their work.
I believe that that infrastructure should be open source to ease adoption, improve integration and provide transparency.

That is what LCAx is about.