NOTHING is obsolete as long as it meets your needs. I am Vaping on the old style Kayfun lite plus, and it meets my needs.
I'm sorry, but I don't agree, if there is a product that is good, and you are fine with it, doesn't mean it isn't obsolete. I could be fine with my older video card, but if I can get a much better one for the same price it has become obsolete.
It 's the same with the goblins, goblin mini V2 is fine, and sure if your happy with it continue to use it.
But if I can get a better product (goblin v3) for the same price, it has become obsolete. Why would you buy a lesser product??
That doesn't mean older products are worse (as in your example, sure the Kayfun can give you a better experience than newer stuff), but if there are other products that give you a better experience for a same price point...you get the drift....and this is the case for the goblin v2 vs the v3.
So yes products can become obsolete, even in vaping land