Yeah this is quite common, somehow I sympathize with both gp and submitter here, the last year I have tried suffered under a group of architects that have greenlit a project where we have now wasted about a man century. All because we ramped up fast into a "fully sovled problem" with new "well understood architectural patterns and design philosophy". And these are not "23 year old CTO" type people, it's people with 25+ years as "enterprise architect" in FAANG type companies.

The main lesson I've drawn is that never propose a technical solution that you didn't PoC and that you only have validated the parts of the system you implemented. Deletion is often harder than creation.