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You can plug the drain or leave the plug out. You only asked why it didn't have a drain, I was simply pointing out that the boat does have a drain and a plug.

I run my sump drain plugged. If any debris gets in the sump, I can get it out before I drain the sump through the clamshell outlet under the boat this way. I have never plugged the drain tube, but I have plugged the clamshell outlet, and it is impossible to rod trash straight out through the clamshell opening at the outlet. It is a major pain if a plastic bag or leaves get to the clamshell.