Baldur's Gate 3 has a big stonking new patch on its way, which is currently in stress testing—and it's almost certainly doomed me to another honour mode playthrough because, well, I've got 12 new subclasses to tinker with and I'm a bit of a build fiend.
One thing had been concerning me, though: The scourge of Booming Blade had been looming large over its current stress test. For the uninitiated, with new subclasses comes new spells and cantrips, including the ever-yearned for 'Blade' cantrips from D&D 5e's TTRPG rules.
To sum it up, these spells make a lot of spellblade builds, such as the terrifying Sorcadin, possible. As per said rules, Booming Blade lets you do a melee attack—triggering things like the Rogue's Sneak Attack, or the Paladin's Divine Smite—as part of casting the spell.
You also get a scaling burst of thunder damage, and extra thunder damage if your enemy tries to run away from you. It's really very good.
Only, up until now, the stress test allowed it to work with Extra Attack—which basically made it free damage. A complete and utter no-brainer with zero tradeoff.