AbdulAlhazred
Legend
Yeah, I agree. The whole "it just isn't a class, it has to be a race!" thing is sort of dubious to start with and is in any case pretty well in hand already with other 'Vampiric' options. Truthfully, vampirism is a vast and various mythology that no one specific game element is ever going to cover every possible aspect of. A DM could easily devise all sorts of variations but I think it is probably asking too much for WotC to try to support all sorts of different variations that will each see pretty limited play time.And here I'm going to say "I don't care." The Vampire class is an excellent representation of schlock B-movie vampires who are centred round being a vampire rather than anything else. They don't work for all campaigns. But if you want "Klaus von Hammer, from ze Hammer House of Horror" it's an absolute blast to play, and the Vampire class matches it well. It's a niche class but a useful one and doesn't fit anything else at all well. (The only other way I can see to do it is a specialised Monk build).
Plot based stuff is a pretty large and nebulous bag too. A vampire lord creating lesser vampire servants? Perfectly nice story concept and no more wacky than a cleric founding a temple and having lesser priests or a fighter building a castle and having soldiers and retainers. As with the way Gary handled this kind of thing way back in the 1e days and before. Your followers are a nice asset and can contribute to your character's success, but they are rarely going to be following you around in numbers like an army, and if they do get used that way you're expending a difficult to replace resource.
So maybe a vampire can make lesser vampires but it requires expensive rituals (fluff this however you want). They can come in darn handy but you can't just pop them out and if you lose one there's no easy replacement that isn't a trade off on other things. If a PC does drag one or two along on an adventure they can be CCs and that will work OK.