I completely agree. While the old Braxton house wasn't the most special or interesting of sets, at least it has some history behind it. I don't know why they would throw away the opportunity to have two houses next door to one another and continue the neighbourly interactions, now between the Palmers and Morgans. Perhaps they wanted to be very clear that the Morgans were not Braxton replacements!
It does seem strange to throw away historic sets like Leah's house and the Braxton house, for a bland new set like the Morgan house.
I love the Farm house, always have. It's one of the most realistic sets on the show, and the only permanent 4-walled house set.