I've done a lot of meditation work over the years. I started with simple stillness and visualization exercises, and progressed to moving meditations. Eventually I started doing sophisticated chakra work and could manipulate emotion at will. I find it very easy to call up a state of profound mental calm if I ever want one, one came to me as I was reading the piece, like putting on an old glove.
I can see how it's easy for someone who spent much of their lives dealing with chatter could fetishize calm once they've gotten a taste of it, but like being pervasively, effusively happy / calm / cheerful all the time, (another thing I've done) it eventually gets old.
Chatter is how the mind works. Staying completely in the present all the time means you're just not exercising the part of your brain that learns. I can turn it off if I want to. But I don't. I liken it to being a dog.
Dogs, and other animals, are excessively present. They don't have intellectual thoughts because they are biologically incapable of them. They're incapable of even having awareness that intellectualism even exists.
Being aphasic is basically erasing a part of you that makes you human. Worse, you don't even have the awareness that you lost it. With our travails and struggles comes our humanity, whitewashing over our mental chatter or our emotions relegates you to a baser existence. You're "happier," but you haven't really evolved to be better in any way.