Android system WebView is basically chrome. Apps use it to display web content. Example, you get a link in SMS or any messenger app, you tap on it to open, the link opens within the app (messenger or SMS app). It will not open on your default browser to display the content. Btw, Web browsers like Google Chrome, Samsung Internet or Firefox don't use WebView, they use their own built-in engine to render pages. So, if you uninstall the WebView, it should not affect any browser. But all links you tap on any app will open in the browser.