This has always been a thing:

A10S in Heavensward, I setup post-Steamroller parties and nobody could get beyond it. It was frustrating. We had no [Duty Complete] then so it was easy to sub in a static and clear it with a competent party.

E1S I was ready to clear on the second pull (it was that easy), but it took me 4 weeks because nobody could do the first phase right. In the end, I subbed in a static that forgot to put [Duty Complete] and cleared the whole fight despite not having even seen most of it, because I knew I could do it.

E2S I got almost to the end on the first party I joined because it was the easiest fight ever. But after 6 weeks, it was evident that this was the hardest fight ever for PF and filtered them so hard even when joining midway progs. I switched to a healer to try and carry them through and cleared pretty quick. In one of them I was rezzing the other healer repeatedly and basically solo healing.

I could go on but this has always been a thing and always will be.

I don't think blacklisting is the solution. I think the other post made recently about recording what % you were at when the first person died or got a damage down, and then allowing PF to filter based on % progress, would help.