>but the largest benefits come from having no visible amounts or addresses

MWEB is certainly an improvement over transparent transactions (and other methods such as coinjoin, coinswap, cashfusion, etc.), and I welcome the litecoin upgrade. I agree that decoy-based privacy is weak.

However, I don't believe that the mimblewimble meets the standard of privacy needed for most users. It's not the visible amounts and addresses, but the links between transactions that are the main problem. CTs on their own are just a "nice-to-have".

The end goal should be a zcash or firo style of privacy. I think you can scale that to a global network with an adjustable block size, payment channels, and atomic swaps between multiple cryptocurrencies. The problem is that zcash and firo have weak tokenomics compared to monero. Grin will have a hard time finding an initial niche that isn't currently satisfied by monero, and if it does take off, its changes could be merged into bitcoin (https://www.truthcoin.info/blog/imex/).