Have you given a look at ethereum? Generally the community there doesn't care too much about wallets, that should tell you something :)
For usage, one of the mains advantages would be for systems that you don't want to use a centralized system anymore - for whatever reason from privacy to control over your data to simply infrastructure reasons (i.e you want 100% uptime and no censorship), and want to transform it into a decentralized system.
For usage, one of the mains advantages would be for systems that you don't want to use a centralized system anymore - for whatever reason from privacy to control over your data to simply infrastructure reasons (i.e you want 100% uptime and no censorship), and want to transform it into a decentralized system.