better oil like taglon would still be more protective and more fuel efficient. its your choice but its not completely logical.
choosing mineral over synthetic since it does its work, a better explanation would be that its cheaper and still full fill oem requirements.
i have used fully synthetic oil in my other car with 5k change interval and guard filters. its 290k driven ALHAMD U LILLAH no issues ever. engine still works and performs fine with 100% AC all the time in the city, on the mountains on motorways. so synthetics have their advantages in longer runs.