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Also not a scientist, but humans lose immunity from each other if they spend enough time in isolation, so a few thousand years of not eating raw meat would also do that I reckon x3
Definitely not a scientist here , I'd say our immune system can be very forgetful because it's a waste of energy to memorize all the different kinds of bacteria that change/evolve over time.
Similar to today's cops, white cells don't care who or what they attack, but they will beat the shit out of it and deport it to El Salvador when told to. Hence auto-immune diseases.
Our immune system remembers just fine, but it's not heritable. Every organism starts with a blank immune system (mostly, mammals can get some antibody protection from their mother, but have to learn to make their own eventually) and the system learns through exposure to the pathogen. No exposure, no learning.