I think it depends a lot on the EA and the seller.
Wrt EA's it's true you often get what you pay for. Cheap online estate agents typically just list your house.
Traditional EA's tend (though not always) to offer a much wider service in terms of providing the pictures, blurb, plans and advice and good ones will always do all the above to show your home to its best advantage.
That said even the best EA can't make a silk purse from a sows ear if the seller isn't open to suggestions.
It reminds me of an old House Doctor program where the house hadn't sold. No wonder. The lady had about 10 cats, 3 dogs and additional animals in the garden to the point it was like an animal boarding shelter.
The conservatory "belonged" to the cats and the dogs "had" the sitting rooms.
The wholes house was neglected and filthy and viewers couldn't even get into some of the rooms because of the animals.
HD went in and did all the appropriate cleaning/re-decoration and said she needed to re-home the pets until it sold.
Seller wouldn't agree and yes at the end of the program the update said the house was still on the market and presumably back to the state it was before the HD arrived.
That's obviously an extreme example but I also think people become so used to their own homes they stop being able to see the flaws in it. As they can live in it as is they assume other people will do the same and/or think preparing it for sale is wasted money.
It's a bit like dog smell
makes me sick but often dog owners don't notice it at all....