The only difference between an imagined smooth solution is the sync mechanism and a unified client application ecosystem, neither of which is really possible without a large company behind it.
I said you don't understand how KeePass works because you refer to 3 applications for 3 different OSes (2 mobile) as if they were a confusing mix of different applications, when really they're just client implementations around a single, formalized spec. And most folks don't use both iOS and Android so really there's just your choice of KeePass desktop app and one for Android or iOS.
No one says the plethora of email client choices is confusing. This is exactly the same.