It is good only if the whole team believes it.

If the team mates have a different mindset, they see it as half baked or hacky. And if there is ever some bad feedback, they just use it as a "I told you so" and throw you under the bus.

If your self-esteem is sufficiently resilient, you can exploit the same human tendencies behind Cunningham's Law (the best way to get the right answer on the internet is not to ask a question; it's to post the wrong answer). Check your crappy end-to-end proof of concept into the team repository, and your teammates will be so horrified and outraged that they'll fix it faster than any sprint could have planned.

Bad feedback can be more helpful than good and is often the only type of feedback a product gets. And you may not have received that feedback if you didn’t ship. It’s better to get that information early.