If tthe only way Nintendo could be assed to create new content people have been asking for is to lock it behind cheap plastic toys then that says a lot about the company, none of it being good.
They have to sell the amiibo somehow man :l. If it means generating new content, then so be it.
I don't like it being tied to significant content too (playable characters from FE in Code Named STEAM, this dungeon in TP HD, extra SP missions in Splatoon, ect) but simple unlocks like costumes and skins? Cool
, non intrusive and a nice little unlock.
Nintendo is backwards on a lot of things, so them making new content only for the amiibo and not offering the options to get it via DLC is a dumb move. But Nintendo is going to Nintendo, and if you don't like it, don't support them.
I only got the third party amiibo only to have it be a nice figurines on my TV, not for any game-related means (don't own New 3DS or Wii U) and I plan on getting the Cloud, Ryu and Shovel Knight amiibo in the future.