Just reading this is glorious.
Although an interesting point, the items made Voli stronger and more flexible but the same happened to other champions. Do you feel like the changes made Volibear even stronger and more flexible than what other champions got?
it seems like you keep testing out super expensive/6 item builds? how has his early/midgame been for you?
what about black cleaver? i forgot the details, but i'm pretty sure it gives health now? could be a good choice on him.
As for the price and these being full builds, you don't need the full builds to be effective. In fact, I have a general dislike for expensive builds, and I'd rather get a very cheap, but cost effective full build in most cases, if I get super fed, then I might start switching items out instead.
But builds should be more expensive across the board with items that didn't have anything they built into having got those options now. QSS for example, and Aegis of the Legion too. All the boots too now have 'enchantments' which also ups the price of full builds.
Generally you do fine with Aegis + Mercs + Randuin's for defenses, if someone is fed or has a lot of armor pen, you should get more of the relevant stat of course. And while these builds have expensive DPS items in them, those are very much luxury, because like you're probably thinking, in an average match on the Live servers, you are not going to be able to build all of it.
Also like I've pointed out, I'm not some high ELO pro, this should all be taken with a grain of salt, and I'm not offended if anyone thinks these builds are 100% stupid. But they feel all right, at my skill level. Where exactly that is, I have no idea. But there you have it