In case you disable it, routerOS will function only as an NTP consumer. Good enough if you wish to use accurate clock for logging etcetera. The products with your community should really use external stratum 3 or four NTP servers such as the pool.ntp.org clusters anyway. Checking the WinBox approach https://winbox88login77420.thechapblog.com/34503400/https-www-winbox88trust1-asia-login-fundamentals-explained