What good are low point drains?

What good are low point drains on a trailer that is supposed to be good for 0 degrees? My drains are solid, slightly flexible, plastic pipe. It seems like they’re going to freeze and bust at anything close to zero degrees. I do have tank heaters, but 10” of ½” pipe hanging down in cold air seems like a problem waiting to happen. All other pipes run in heated areas. I see the purpose of low point drains for folks that winterize just by blowing out with no antifreeze. However, since I use antifreeze, I see no value in the drains along with an increased risk of freeze/bust.
1) What am I going to regret if I remove the low point drains?
2) How can I keep them from freezing until I get them removed?
Thanks