The two main reasons imo why Grin is important are not only the privacy, which is well covered here, but also the on-chain scaling implications. We won't know

The two main reasons imo why Grin is important are not only the privacy, which is well covered here, but also the on-chain scaling implications. We won't know till it's actually used, but there could be orders of magnitude greater on chain scalability for this BTC while retaining proof of work... This is a major accomplishment and both Grin and Beam are major steps forward for crypto.