(To Rag's question) It is, yes. We should remain civil and polite to one another - the other actual users on this forum. This does not preclude being critical of decisions made by corporations, or criticising the game itself in various ways. The statement is an unfortunate truth: either they don't know and don't care enough to check their facts before committing resources, or they do know and they don't care at all; neither is an inspiring situation.
(Off topic vamp-related)
It's not as though they're invincible or invulnerable to anything else. A vampire spawn (not a full vampire), is destroyed if it is staked while it is Incapacitated, and in its resting place; these are important conditions that tie into the creature's background lore in the forgotten realms specifically (Ravnica vampires don't have this set of vampiric weaknesses because this is not part of that world's lore for the origin of vampires), and serve as a way of instantly destroying an otherwise tough creature for lower level or less capable adventurers (or peasants). Higher powered characters and more capable adventurers wouldn't need to rely on such methods - it's just a shortcut, or particular vulnerability that this kind of undead has, due to the specific nature of their curse and its origins. A true vampire isn't even destroyed by this weakness - only paralysed until the stake is removed.
If you stab one in the chest with a stake while these conditions aren't met, it won't do the special thing... but you did still just stab them in the chest and they're going to take damage, just like anyone else would. You could even kill them that way, if you reduced their hit points to zero ^.^
For me personally, I'm going to lose respect for a Dm (or anyone really) who would discard established in-universe lore for creatures out of hand or on a whim, while still claiming it to be that creature, in that setting.
Bonus Edit (catching the intervening posts): For trivia for PrivateRacoon, when it comes to piercing materials like flesh and muscle fibres, such as for chest intrusions, the material is really less important than the shape, texture and angle of entry; all else being equal, you would actually have no more difficulty with a wood stake as a metal one, provided the wooden one was sufficiently well made. It's really less about the physics of the action, as it is about the nature of the original curse - and for vampires it is a soul curse, rather than simply undead animation or arcane artifice. Think of it this way: If you have a friend who dies, and then you raise their body as a zombie for party tricks... you can still cast true resurrection while the corpse is dancing in order to recall their soul to life - the spell will create a new body for them, because the old one isn't available (what with being animated by dark magic), but the soul itself is free to return, provided they're not too salty about your party trick. If your friend became a vampire, however, True Resurrection would not work until you destroyed them because, while they are a vampire, their soul is not free and is still housed, in cursed form, in their original body.
