Because if the site stayed the way it did it would die in 6 months.
Can you list a few sites that have stayed exactly the same for the last few years??
Well, the site had been left unattended for so long, many of its function were not working or dysfunctional so changes were much needed.
@Nick but you only joined yesterday
I personally don't think it has... not since I joined anyway
I have no idea, but I actually kind of like the new layout.