Currently when using a mobile browser and a user is not signed in and then clicks add to wishlist, Steam redirects to the login screen instead of just trying to open the Steam app.

There's a button on the top to open the app but it's easy to miss and I bet a lot of users just give up to wishlist instead of going through the trouble of signing in again.

On desktop, the "Open desktop app" button is more visible but again some users will scroll down to see the game details and may miss or forget to scroll up to open the app and will also give up instead of signing in.