You are right 99.99% of the time it's ok to trust the media hosting someone is using for trivial memes etc. But if some controversial video is released, it would be great if anyone could re-upload the original to other servers and they'd all serve the original and any client could verify it's original, etc. That's the problem blossom is solving.

Re. my use case, I'd like to host some code in the same "link rot avoiding way", and I know you wouldn't probably transform it anyway, but I will also upload images that shouldn't also be transformed. I haven't considered git, and maybe I could even just host it all in nostr events... We'll see. 

My point in posting here was to understand what problem blossom solves vs nip96, and I'd say a small addition to nip96 could make it supercede blossom and you could then just ignore it :)