Dogs are smart but the whole them trying to talk is just them copying us. We are their pack now, so why act like dogs when we give them more attention if they act like us? We wear clothes and force it on them, eventually they don't care and may enjoy it. We eat a variety of meals, so they get spoilt for choice and want something that smells nicest since they don't taste like we do. They act like they're trying to speak accidentally or because they're trying to replicate us. All those videos on dogs trying to talk are a tiny percentage. Its maybe 10,000 videos are the MOST, out of something like a billion dogs? Tiny faction.
I love dogs so that wasn't a rant, I consider both of my dogs intelligent, they know when they haven't been given all the treats I took out of the tin. They know when they should be fed, they know my footsteps compared to other people's. Dogs are smart enough, in my opinion, if they got smarter, they'd be too human. We love dogs because they give love unconditionally, are always happy and friendly, and make our lives better. If they got smarter they'd be more like humans which would make they entirely different.
Leave dogs as they are. Dogs still know when humans are in danger and do astonding acts to save them. Like that dog who's owner was badly injured after falling out of their wheelchair in the middle of nowhere. The dog dragged the person into the recovery position before taking out their phone and holding it to their face like it had been taught. But after doing what it was taught it ran all the way to the man's house and barked until a neighbour came out. The neighbour thought it had gotten lose and tried to collar it so it ran away to get someone else. It led the other guy to its owner and saved him. Seriously, that is intelligence, but it is enough.