Draining water heater, put anode back in or not?

For another non RV project I reduced my wet/dry hose size using clamps and vinyl tubes to get out water out of a real small place.

When changing my anode I thought about sucking out the water out of the bottom of hot water tank and then letting it dry out, then put anode back in. My thinking was no water, no rust. Then I think about a hollow steel container would just slow down the process and not be worth the hassle.

Wonder why you can get propane tanks made of fiberglass and not hot water heaters?