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.
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.
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.