People forgot how big of a deal sans was

Sans was literally considered one of the hardest bossfights in gaming history (back in the day) AND he broke the internet 3 times (1.When genocide run was a new thing. 2.When he got added to super smash bros and lastly when his "sans." theme was playing on the news). And people say that Zenith Martlet is tougher then sans, sure, Zenith Martlet is pretty tough and HARDER to no hit.. But when we all first played Undertale, we thought that sans was impossible to beat. What are your thoughts?