It's always a bit savourous to see the diferences between some wishful thinkings and the reality. Windsor has been called, on this very same forum, a "second rate venue" not less.
So despite some media pressure and let's some some enthusiastic fans, the BRF and the couple itself did not jump in the "Princess Diary III : Meghan goes to London" bandwagon and instead chose THEIR venue for THEIR wedding. I think it's just great and a credit to Harry and Meghan.
Besides, it's a clear and elegant reminder to everyone who they are in the order of succession and their position inside the Family (aka the younger son of the heir).
Windsor is an incredible place, it will be a wonderful wedding.