The audience (first-time viewers) will have a hard time accepting that Anakin has killed younglings when it is not shown, which will benefit the film’s increasing tension at this point. It will add an extra element of unconfirmed horror - the good ol’ The shark is scarier when you don’t see it.
And then, you could, for the ultimate WTF gutpunch moment, show brief glimpses of the Youngling’s deaths / murders when Padme confront Anakin at Mustafar: “Obi-Wan told me… you were killing younglings”. Anakin reflecting on a closeup, then BOOM - horrific, short flashback glimpses, some swelling horrific soundwork, followed by back to present and a conflicted, but firm, “Don’t listen to Obi-Wan” from Anakin. The ultimate confirmation that Anakin has gone totally bonkers and is beyond redemption.
The stakes are at an ultimate high right before the choking of Padme and the ultimate duel of the fates, and the “Anakin… you’re breaking my heart” hits on a different level.
In this paticular instance I think it could benefit the story.