In Nougat, Android System Webview should be disabled by default, since Chrome is supposed to take its place. But if you've disabled Chrome, then I believe Android System Webview is important to keep enabled and up to date, for security reasons.
Read more about it here: https://www.technorms.com/64548/android-system-webview-details
If you disabled Chrome, that might be why Android System Webview is active.
In Nougat, Android System Webview should be disabled by default, since Chrome is supposed to take its place. But if you've disabled Chrome, then I believe Android System Webview is important to keep enabled and up to date, for security reasons.