Regular drainage of HW heater, or leave it alone?
If sediment does collect in a gas water heater tank, that forms an insulating layer at the bottom of the tank and the tank bottom itself gets to a higher temperature possibly damaging the glass layer and letting corrosion set in sooner.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.