I was just thinking the same! I can't for the life of me think why you would do that.
Can only think that maybe the orig lamp/gate assembly was missing/fubar so this was installed.
Maybe Poibug/TYHO will shed some light on it, as it was his game until 2 weeks ago ...Chris ???? We need answers
UPDATE - just asked Poi. Yep - it was missing the gate and that fitted and does the job.