4. DLC is better than amiibo - There, I said it. For one, DLC comes without a stupid plastic toy. Two, DLC removes more substantial content from games than amiibo, so paying for DLC is worth it while paying for amiibo is not. And three, since DLC is entirely digital, there's no risk that a late-night trip to the toilet ends with stepping barefooted on a figurine that your kid didn't put back on the shelf where it belongs.
100% agree with this. Anything that comes with Amiibo should really be available to purchase as a regular DLC without the figure as well. Not as if there's anything from Amiibo that I think would have been worth buying yet, but at least if it was available without the figure the chances of me buying it would be higher than 0%...
I think amiibo is cool when it's adding something interesting while still not being meaningful content. To exemplify, the best use of amiibo in my opinion is the Wolf Link amiibo in Breath of the Wild - it's a nice easter egg, it's really cool, yet anyone who doesn't have the amiibo isn't really missing out on anything and still has a complete experience. In fact, it wouldn't even make too much sense to pay for that as actual DLC or something.
There is a problem when the amiibo are locking content, though. Those cases should just be available as paid DLC.