The biggest issue we have in the crypto space is crypto wallets, there are a few things that haven't been fixed yet or haven't been made easy yet.
There will always be problems and something to fix, that's why there are always updates to these apps sometimes. If these problems have been noticed or pointed out before these apps/exchanges were created, I am certain there would have been sorted out by developers. Also there are certainly other more challenging issues than just crypto wallets in the cryptospace.