It appears scoed was posting as a realist, talking about what IS now the situation in game, and making statements of current fact.
Rainbow appears to be posting as an idealist, about what TS4 SHOULD look like, and taking scoed's comments as endorsements rather than reporting of current on the ground facts.
It's a problem with the English language that there's usually no linguistic differentiation between stating a fact and stating a goal, specifically; I think it's a lack of differentiable verb tense with the imperative.
I was also rethinking my solution idea. Adding a new game item is the correct solution, cloning the plasma pouches is probably the best asset solution atm, though I'm unsure what implementation problems that entails, with TS4 using at least 3 incompatible programming languages in a glorious design "triumph". The whole point was to have a clean code break with Maxis so it never gets broken by "world class" Maxis QA coders.
Video game crafting is always popular now, but catering to contemporary Medievalists is wrong in any context. We have an amazingly functional system of fungibility with currency already, and it's one of the few parts of TS4 that works well. Given all the plasma products(I think) have Simoleon value, just selling them and buying the new functional item is the obvious solution.
So, a new plasma pack with stats that actually fill as much Vamp thirst as a plate of food does normal sims, that can be bought with Simoleons.
Unfortunately, Maxis seemingly forgot how it's own food stats actually work, and has only sporadically released new foods with correct calorie data, but one plasma pack = full thirst bar is the simple answer. The problem is I was attempting to do this right, not just quick and done, and I know the calorie system was intrinsically tied into the fatness system before Maxis forgot how it's code worked.
So now I need to find out exactly how the code deals with Vampire feeding calories. I suspect it ignores them completely, as I've never seen any of my vampires get fat off plasma, but I don't know that for a fact. Then there's the question of whether or not plasma SHOULD have calories for a Vampire, without real life vampires to draw conclusions from, it's purely a question of game mechanics, which I'll have to think about.
Really shouldn't have to do all of this, but marketing demographic algorithms replacing actual game design are an established industry "feature" now, and Maxis admitted they jumped on board back around launch.