My main website

My main website, which has pages and pages of projects is at www.g3xbm.co.uk . Now it appears that Google want this to move to the new Google Sites. They offer a preview. I tried this. Yet again, it seems a step backwards.

I have, for now, dismissed it. Certainly it would require a lot of edits before switching. Why, oh why, do corporations make things worse? If it ain't broke, don't fix it. 

Sorry Google, but why? Who gains?