That’s code review.
Only on very small projects.
As the team grows, having just 1 person review your code is simply not sufficient.
Even 2-3 may not be enough to sanity check if a larger new feature on a massive project is good. If it impacts the team and means a fundamental shift in methodology, then you need more voices weighing in.
Now, can you merge the PR in first, then have the meeting after? Sure, I guess, but why would you?
If the team reacts negatively to what you built, finds flaws in it, or simply just doesn't get it because you overengineered, now you have to revert the PR and go back to the drawing board.
It makes tremendously more sense to bring folks impacted in on a swarmed live PR review as you go over what you did, where you did it, and why... before you merge it in.
At this point you can QnA, get suggestions, feedback, etc.
Now typically most of my response to live chat feedback is "aight, can you add that as a comment on the PR itself so I can see it after?" And then they go and do that asap, usually typing it up as I answer other folks questions. Because at this stage the PR is literally the perfect place for feedback to go.
I've been down the path of "1 person LGTMs the PR, huge new feature is added, I document it on the wiki rigorously, I post the new feature to chat... 1/10 people bother to use it and 9/10 give blank glassy stares when I bring it up"
It. Doesn't. Work.
Period, lol. And don't get me wrong, I wish it did, but people just don't RTFM mate, that's a fact of life a d the sooner you accept that, the easier the job gets.