how is this different than any other standard military frag bomb or grenade?
Cheaper and probably less effective than a purpose-built one, that's more or less it. As to why vatniks are so worried about them, well, your guess is as good as mine. These do look sorta gruesome compared to regular 'ol factory-made frag mortar rounds that the Ukrainians have generally been using, so maybe vatniks just assume that they're somehow worse?
Yeah it's all about appearance. It's human nature.
Same thing in the US. We have a ton of people trying to ban AR-15 rifles because they look scary. They act like it's some sort of urgent public health emergency and tons of people are dying all the time because of these awful terrible military death sprayers.
In reality more people are punched and kicked to death every year or beaten to death with bats than are shot with all types of rifles including ARs.
In a country of 320 million people, rifles of all sorts kill at most a couple hundred every year. It's not at all as serious threat to safety, but people obsess over it because it looks scary.
Obesity related illnesses kill 300,000+ Americans per year, but you don't see anybody talking about banning cheeseburgers.
Meanwhile in Ukraine, the happy little almost cartoon-shaped frag bombs dropped from hobby drones are killing Russians with great efficiency. But they don't look scary or gruesome so this stupid thing gets the attention.
I think it's just human nature. We focus on what looks frightening, not what actually threatens us.
Generally if you try to kill someone you should expect them to try to kill you back if you don't immediately succeed. If it's a whole country then you can expect them to try to kill you back even if you do succeed. What a fucking surprise.