Yeh the changes will make fitting oversized batteries harder (or outright impossible depending on choices / ships) but you get a lot more cap bonus for it. At the other end you have a slightly smaller cap pool by using a medium than you would have on an old large in exchange free up loads of fitting. Things have just re-aligned, I don't think it's a better/worse scenario here. It'll work better on some ships, worse on others - just like most of these tiericide changes.
How come the Damage Control changes are going to break things NZXT30? Lack of the old low cpu usage option? Without running the numbers I'd have thought the new hull resist and swapping to an armour resist would work better than a DC in some cases.
These changes to so many things are going to be a real fitting shakeup though. Looks like a lot of things are having their cpu usage increased.