I strongly disagree with this proposal of making bigger ships require more maintenance. Both for logic reasons and for gameplay reasons.
The equivalence based on size we have with these latest changes, where a 10000 tons ships requires the same amount of maintenance as, for example, 5 2000 tons ships, is a good one. True, the bigger ships has the added complexity of some bigger components and the like. However, similarly the smaller ships will have a lot more components, and some of those will hard to maintain no matter what their size.
In fact, following this reasoning, I'd even say the 5 smaller ships would be harder to maintain that the bigger one. Because some components will need maintenance that cannot be "compressed" just because the component is smaller.
From a gameplay balance point of view, putting a penalty on bigger ships maintenance seems to me the very thing Steve wanted to avoid. This new system is both harder and easier than before. Harder, because you need a lot more facilities than before if you have a big fleet. Easier, because you are not in a situation where it's "all or nothng" as before, when the ships were too big to be maintained in a certain place. I like this change and adding some more limitation against bigger ships would only, in my opinion, bring us close to a situation like before.