A lot of the stat blocks seem to strip monsters of their abilities that don’t fit their theme. Many get additional actions per turn to do their signature ability, such as slinging webs, blasting spells or teleporting. I like all of that.
It's funny you should mention that, because the next stat block is something I would consider a counter-example to that trend.
Bard (VGtM)
The not so humble Bard, everyone’s least and most favorite support unit. In this book, the Bard comes with a random table to determine their performance type. Notable inclusions are Puppetry, Bagpipes, and the art of Mimes. How these work in combat is up to you, but if they aren’t absurdly over the top, are you really playing a Bard? I can just imagine some confused players trying to dispel the "invisible chair" that the bard is sitting on and wondering why it didn't work.
In combat the Bard has Taunt. A bonus action that inflicts disadvantage on checks, attack rolls, and saving throws. Which makes it the ideal opener for whatever plan of attack you have. Speaking of attacking, the Bard has Multiattack, allowing them to stab or shoot, or weapon attack and cast a spell, twice in the same round. Alternatively they can use their Point Blank AoE power Cacophony to inflict some damage and knock away aggressors.
Sleep is a significant control spell,
Charm Person is more for out of combat uses, but could be comboed into from a Taunt to stop a raging barbarian.
Invisibility is either for ambushing, playing a prank, or most likely running away. Their At-will spells are not really useful in combat, save for maybe
Dancing Lights being used to light up the battlefield.
Changes to the Bard: The loss of spells,
Heroism, Thunderwave, Shatter, Healing Word, and the most egregious of all,
Vicious Mockery! Song of Rest was also deleted. In return they got the spell
Prestidigitation, Multiattack (which can also be used to cast a spell) , and the ability Cacophony, which mimics some of the damage spells they lost. Taken as a whole, the changes make for a better disposable enemy, but a worse NPC companion.