Free market my friend. Our new DEX comes with the option to create a wallet on the platform using the Magic wallet service that allows people to get started using an email, Google, Discord, or Twitter accounts. They can then sign into the the Magic Wallet service using the same account and retrieve their private key when they want to. This makes it an easy barrier to entry for people.
I think you will see more and more wallets. More options the better in my opinion. Think about the different ways we have to sign into Hive. Some platforms like Peakd have their own 'keychain' kind of feature.