No problem. Our import process can handle this, by italy girl whatsapp number converting them from placeholders to actual chocolate bars. The content field now looks as it should, but wait a minute... why isn't the user's avatar image showing up? Oh, we decided to store the file based on the username, and our file storage doesn't allow for storing a file like 氷の男.png. Easy, just run it through a hash function and save it as f07db9de.png.

Perfect! The comment field and image are displayed just as you would expect in the back office. But huh? Now we're getting reports from the user acceptance testing team that they're seeing boxes instead of chocolate bars? Ahh, no big deal, it's just that the font we've selected doesn't support emojis and they appear as unknown characters. Our design team and front-end developers can switch to a variant that does support them.
And now, finally, everything that could (and did) go wrong in our fictional case has been fixed and we are ready to go. The difference from the process (big bang vs. gradual) is that all of these issues could have hit us at the same time with fifteen other similar issues. It would have been an overwhelming amount of work to fix "such a simple thing like that." With daily incremental imports, this is more likely to have surfaced earlier and with enough time to handle the issue before production launch.