[toxodont]

Sounds like you didn't have a very good try at presenting your alt. architecture to the enterprise architecture team.

As an architect I don't mind alternative approaches and variances from a stated architecture if they can be justified.

[thinkharderdev]

The issue is that the team/person doing the implementation has to "justify" their architecture to someone who won't be themselves working on the implementation. Or just in general separating "architecture" and "implementation" into separate tasks done by separate teams. The people in the best position to weigh the relevant tradeoffs and design the best architecture are the people who have the most domain knowledge of the problem being solved and who will ultimately be on the hook for the system when it is production.