True the simpler wording is more easily understood, but as my old theology professor (a Lutheran) told me...."words mean things". Consubstantial has a deeper meaning than the words "one with". I fondly recall my professor explaining the significance of even the simple words "light from light" in the Nicene Creed.
There are a lot of simpler translations that also spread dangerous false doctrines amongst the faithful, or which at least lend themselves easily to a false interpretation of doctrine. For instance, the statement "One with the Father" in the Creed can be interpreted in both an orthodox and a heretical manner. On the heretical side of things, the phrase can be interpreted in the sense of merely "one in purpose", or even as supporting the heresy of modalism. The use of the phrase "One with the Father" can thus foster a false, heretical, condemned understanding of God that could lead people away from God.
Although, it may be an unusual word for most people, the word "consubstantial" crushes all false or heretical understandings of the nature of the Trinity. This word theologically is by far the best word to use in the Creed, the only problem is that Catholic Priests don't seem to ever teach people what its meaning is. Priests should teach and preach about the meaning of this word more often and clearly.