Very true.
I have several infp friends, and they are all completely different. Enneagram and subvariants, and all types of other factors (experience, intelligence\s, values) play a huge role in how an infp 'turns out'. Everybody seems to think all infps' have the same flaws or strengths, for example, and it's not the case. I have no problem doing domestic duties and I never really become overtly negative. I have two infp friends who have endless motivation.
Our other friend is head of a club at university and is super organised (I tend to be as well, when I'm focussed).
We're not all the same by any means at all. Having spent years around several, the differences are immense.