I think using native UI components is the least of 1password's UX problems. I'm a long term user of 1password on Windows and Android and I find the user interface to be incredibly unintuitive. Things that should be simple such as moving passwords and creating new vaults seem needlessly complex to do. The new vault button is in a different place to everything else and at the bottom of the list of vaults. For me, it's one of my least favourite apps to use.