"Oh I knew they'd say that it's why I didn't get them to test it "

Did these words really just come out of your mouth? Who the fuck left you in charge of planning this shit?

Some team manager requested dev work it got approved and done standard. However they knew from the get go their team would rip it apart so when it came to the testing phase did he get his team to use it?

No he pulled fucking random people from other teams who don't use this feature at all in their day to day to test and sign it off.

Sod your vision mate. Our team just lost two months of work your team's productivity has dropped because you had a picture of how things should be but didn't want to be told no. And for a fucking valid reason your method is shit.

Don't think he'll be left in charge of a project anytime soon.