I think the benefit in game varies by amiboo. They do make you never have to resource hunt in breath of the wild if you have enough of them and they are quite nice. I agree that they won't handle a child forcefully using them very well but they are nice collectibles and good looking figurines. I think they are worth it and if you look at ebay they still have decent value (although this one being available for a while now will have decreased its value presumably). That being said I could have bought more games with how many I have purchased now but I do like the small collection I have.
Been available for a couple of months now but will add heat anyways
I had many amiibos, but have since got rid of all of them (with the exception of 2 broken ones). That was the only benefit to them holding their value, I could trade them in to CEX to get games in their place (which is a much better value for money). 3 amiibos which as you call them "are not toys" and do very little for bonuses, will set you back the cost of a Nintendo Switch AAA game... I know what I would prefer.
They are not toys, but nothing stops children from play with them. How many amiibo have you got, Johnny?
They're not toys? Try telling that to a child.... These are the equivalent to Skylanders, which again are designed to be toys. However Skylanders were a much stronger build, allowing children to play with them without the fear of breaking them. If a 6 year old can snap an arm of an amiibo then they are not very durable, again this is my opinion from my experience with them.