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It's annoying. I don't want a dog staring me down while I eat. It's rude, irritating, and makes you bad dog owner.
There is something wrong with begging. Sometimes the pant and get their hot stinky breathe on your food. Sometimes it’s dangerous and it’s also just rude to other people. 
Having a well trained dog is good but it makes your argument invalid because the sheer act of sending them away means your acknowledging the fact that it’s bad. >

Why is your dog 2 inches from your food and therefore capable of breathing on it? The only instance I can see this is possible is if they’re standing an inch from the plate whilst you eat. Why are you eating on the floor or why is the dog at the table?
And the act of sending them away doesn’t = bad. It just means it’s not safe for them to be around the area at that moment.
I don’t care if my dog watches me cook, the same way I don’t care if my son watches me cook, however I send them both away when I carry hot water from the stove to the sink. >

It's not safe for them to be around the area at the moment = something wrong with them being there right now >

Have you ever stood close to your dog and watched them as they ate. Some untrained dogs may growl or snap at you, while other dogs may refuse to eat until you leave or will take their food to another location, probably their cage. Why? Because it’s uncomfortable and they feel like you’re intruding on their meal time or may even think you’re trying to steal their food from them. So if a dog realizes there’s something why can’t a human.
A well trained dog will understand that your food is your food and his food is his food >

If you're sending them to bed then you're ending the  begging. Which isn't dangerous but it is annoying af. Especially when the dog has their own food. >

Yeah, which is why he said it's fine 90% of the time and send them away the 10% of the time it isnt >

But the whole thing is stupid. It's fine to them. It's annoying af to me. No one is saying a begging dog is a danger or a health hazard It's just annoying. There's no view to change its a comfort thing. I don't like being watched while I eat. >

I mean it's a danger sometimes, like if you're moving hot stuff you don't wanna trip on the dog, etc. In any event, sure, it may be a nuisance but idk if that makes it bad. >

Training out a response to the behaviour which puts a stop to it implies that it is not good, maybe at best annoying but certainly not something you're encouraging. >

I don’t think it necessarily implies that a behavior is good or bad. Training a dog to “shake” doesn’t mean that the dogs natural non-shaking behavior is bad. >

But it's the opposite - OP says there is nothing wrong with the behaviour, but if that were the case there would be no need to discourage it.
Training a dog to shake is adding a behaviour. Training a dog to cease a behaviour is removing one. >


If you train your dog correctly you should be able to send them to their bed, so if they’re ever begging when you’re cooking or it’s dangerous for them to be around you, you can just send them to their bed

What would you do that? >

What? >

Apologies. Why would you do that? >

What's wrong with it is that it is insensitive to whomever might be at the table. Moreover, for my dog, a service dog, begging explicitly means not paying attention to his job. 
Bad manners are bad. Even for dogs.