His list is a list of reasons why he was motivated to do something. It does not matter how subjective the list is, since its purpose is not to convince others. It just matters that it connects with him.

If you're potentially interested in his project, you should evaluate your interest based on how much you think like him. If his complaints aren't yours, no skin off your back. Just ignore him. If they are, read farther.

Yes, like I said, I didn't think denigrating Anki was specifically Fernando's purpose here.

However the reason I find it off-putting is because, as someone who generally lives in the terminal, and Anki is one of the few remaining GUI apps I rely on, I actually "would" have preferred a decent terminal alternative with similar features. But introducing the alternative by saying how much Anki sucks immediately puts me off when all that criticism doesn't resonate with me.

It literally works as anti-promotion here: if Hashcards promotes itself as missing all those features of Anki which I think are great, and my time is limited, then I have much less of an incentive to invest the time to check it out. Which is ironic, because in reality it may be great (like most of his other work) and actually suit my use-case really well.