~snip~
1: What features you want to see in a wallet which is not in other ones
2: How User Interface or User's experience can be improved in this wallet.
^ There are various crypto wallets, there are too many of them in the crypto space. But if you prefer to use a bitcoin wallet, I suggest choosing only for a bitcoin storage. I hate using a multi-sig wallet that supports other cryptos because usually they have fixed fees and you cant able to modify the fees. Unlike electrum, focus only on bitcoin as you can see, people will like to use it because aside from free to use, it is a fully open-source wallet.
There is no problem with the UI, as long as your wallet is safe and you are the one who controls the key.