It's not about the provider. It's that on-chain just works. Lighning requires, setup, config, management and maintanance. With bitcoin the block chain handles all of this for you.
Great post. Brilliant news that Amethyst now implements this. On-chain payments was always going to be phase 1. A bit of trial-and-error ahead, but it opens countless doors. Next learn about tweaking keys. Add one to your privkey and then add one point to the pubkey and you have a whole new set of keys.