Downside on not using Ionic components in mobile app

I originally posted this on stackoverflow, forgot to check if there was an ionic forum.

I am creating a mobile application using vuejs and ionic capacitor. I am not able to use v-model to bind to ION components it looks like I am able to use regular HTML components such as input and button

<ion-input type="text" :value="email" @input="email = $" placeholder="Username"></ion-input>


  <input type="text" v-model ="username" placeholder="Username"></ion-input>

Apart from having to craft the styling myself, is there any other downside I am missing. The app appears to run fine on native ios and Android devices.