The key here is what has never been easier. Is it [defending] or [defending fortress walls]?

Most likely the sentence means that defending becomes easier, in which case the singular “has” is correct. The other interpretation (where “have” would be correct) would mean that those fortress walls are doing the defending, rather than someone else defending the walls; and the walls have become easier, which makes no sense.

Sorry for not using fancy grammar terms; it’s been over 20 years since I studied English grammar.

Well, have you tried adjusting the slider in the settings? I mean, if they put in a slider for that one singular purpose, it can’t be for nothing, right?

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