I've read that there certainly are types of snails that will eat the plants...and I think they can look pretty similar to the kind, gentle snails. IME, I've had snails for years and I've never noted them doing any "new" damage to my plants. So, I don't worry too much about them.
Having said that, I have added a number of loaches, partly for snail control but mostly because I think they look pretty cool. The loaches have controlled the population somewhat, but I do still have visible snails at all times.