You can long tap the app icon (depends on the launcher) to open the app shortcuts. One of them is to open the subscriptions tab. You can long tap + drag to move

You can long tap the app icon (depends on the launcher) to open the app shortcuts. One of them is to open the subscriptions tab. You can long tap + drag to move it to your desktop (again, depends on the launcher) so this way you can open YouTube directly to the subscriptions!