Why don't you tell your boss or team something like that and see how well that flies.
The responsibility of the devs is to deliver what was asked. They can and probably do make notes of the results. So does QA. So do the other stakeholders. On their respective teams they get the same BS from everyone who isn't pleased with the outcome.
Ultimately things are on a deadline and the devs must meet requirements where the priority is not performance. It says nothing about their ability to write performant code. It says nothing about whether that performant code is even possible in a browser while meeting the approval of the dozens of people with their own agendas. It says everything about where you work.
The responsibility of the devs is to deliver what was asked. They can and probably do make notes of the results. So does QA. So do the other stakeholders. On their respective teams they get the same BS from everyone who isn't pleased with the outcome.
Ultimately things are on a deadline and the devs must meet requirements where the priority is not performance. It says nothing about their ability to write performant code. It says nothing about whether that performant code is even possible in a browser while meeting the approval of the dozens of people with their own agendas. It says everything about where you work.