It's a stupid trend IMO which absolutely comes from a place where it's normal to declaw cats. BTW - "declawing" is horrific and involves amputating the end of the toes at the first knuckle. Cats then walk around on the raw wounds without anaesthetic until this is healed. I think it's a disgusting practice and any product which is claiming to be "an alternative" or "better" is just perpetuating myths that declawing is a normal thing. Thankfully it's never been allowed in this country. So any "alternative to declawing" being sold here is pure marketing.
They don't need claw covers. They don't need their claws clipping either. Their claws serve an actual purpose and if you are so horrified by the idea of a cat scratching your furniture or killing wildlife then you shouldn't get a cat.
FWIW, they tend to scratch less when allowed to go outside and given appropriate materials to scratch on, then you can discourage them from using the furniture, but you're still going to get some scratching happening while they are learning.