737 Aircraft Lighting

So on some NG 737 aircraft there are the ones with standard blinking strobes and a standard blinking beacon. Some NG aircraft also may have LED strobes and a standard blinking beacon, this light combo is also the same on the MAX. Is there any reason though that airlines aren't converting the beacon lights on the NG to LED beacons? Also why aren't the MAX aircraft equipped with LED beacons?

Thanks, Alec.